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Our sources

The primary sources behind our guides: platform documentation, methods and standards. Links checked on 29 October 2026.

Where to find customers: search or social

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  1. Google Ads: About the Google Search Network
  2. Meta: forms, messaging and calls, November 2023
  3. Meta Business Help Center: How to choose the right ad objective in Meta Ads Manager
  4. Meta Business Help Center: About A/B testing
  5. Meta Business Help Center: About the learning phase
  6. Google Ads API: Experiments overview

A cheap lead can still be an expensive customer

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  1. Shopify: Customer acquisition cost
  2. Google Ads: About conversion values
  3. Yandex Direct: Revenue and conversion value
  4. OpenStax, Principles of Managerial Accounting: contribution margin
  5. Wall Street Prep: CAC payback period
  6. IFRS Foundation: cash flows and financial results
  7. IFRS Foundation: agent role and commission, 2023 review

Prepare your website for search and AI answers

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  1. Google Search Central: AI features and your website
  2. Google Search Central: Optimizing for generative AI search
  3. Google Search Central: creating helpful, reliable content
  4. Search Console: URL Inspection tool
  5. Google Search Central Blog: Search Generative AI performance reports in Search Console, June 2026
  6. Bing Webmaster Blog: Introducing AI Performance in Bing Webmaster Tools, February 2026
  7. Yandex Webmaster: site visibility in Alice AI (Russian)
  8. OpenAI: Overview of OpenAI crawlers

How to agree on what makes a qualified lead

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  1. Yandex Metrica: importing offline data
  2. Yandex Metrica: sending and processing offline conversions
  3. McHugh M. L. Interrater reliability: the kappa statistic. Biochemia Medica, 2012
  4. HubSpot Knowledge Base: Use contact and company lifecycle stages
  5. ICO: Principle (c) Data minimisation
  6. Meta: lead generation tools and CRM integrations, November 2023

How much can you pay for a lead and a customer and still stay profitable

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  1. Shopify: Customer acquisition cost, cost scope and the 3:1 guideline (vendor blog, definitions only)
  2. David Skok, forEntrepreneurs: SaaS Metrics 2.0, LTV:CAC and CAC recovery guidelines (subscription companies)
  3. OpenStax: Principles of Accounting, Volume 2, contribution margin
  4. Wall Street Prep: CAC payback period (vendor training material, definition and formula only)
  5. Google Ads: About conversion values
  6. Google Ads: About conversion adjustments (returns and cancellations)
  7. Google Ads: Find out how long it takes customers to convert
  8. Yandex Metrica: Importing offline data (CRM orders, conversions, calls)
  9. IFRS Foundation: IAS 7 Statement of Cash Flows

Why lead-to-sale conversion is 3% in one report and 12% in another

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  1. Google Analytics: Cohort exploration
  2. Google Analytics: Funnel exploration
  3. Yandex Advertising educational article: cohort analysis and building cohorts in Metrica (in Russian, updated 23 Sep 2024)
  4. Mixpanel: Retention report documentation
  5. Amplitude: Interpret retention analysis
  6. HubSpot: Default deal properties
  7. Bitrix24 Helpdesk: Reporting period in CRM
  8. SAS/STAT: Overview of survival analysis, right-censoring

Is your company visible in AI answers? Measuring when numbers are noisy

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  1. Google Search Central: Optimizing your website for generative AI features on Google Search
  2. Google Search Central: AI features and your website
  3. Search Console Help: Generative AI performance report (Search)
  4. Google Search Central Blog: Introducing Search Generative AI performance reports in Search Console, 3 June 2026
  5. Google Search Central: Google common crawlers, including Googlebot
  6. Search Console Help: URL Inspection tool
  7. OpenAI: Overview of OpenAI crawlers (OAI-SearchBot, GPTBot, ChatGPT-User)
  8. Perplexity: PerplexityBot and Perplexity-User crawlers
  9. Anthropic Support: ClaudeBot, Claude-User and Claude-SearchBot crawlers
  10. Bing Webmaster Blog: Introducing AI Performance in Bing Webmaster Tools Public Preview, 10 February 2026
  11. Yandex Webmaster: Site visibility in Alice AI (Russian-language page)
  12. Yandex Webmaster: Search with Alice, YandexAdditional and YandexAdditionalBot
  13. Google Analytics Help: Default channel group, AI Assistant channel
  14. Search Engine Journal: AI recommendations change with nearly every query, SparkToro (30 January 2026)
  15. Search Engine Journal: How to track AI traffic in GA4 without undercounting it (15 July 2026, trade publication)

Which customer acquisition channel to start with

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  1. Google Ads: Choose the right campaign type
  2. Google Ads: Use Keyword Planner
  3. Google Ads: About campaign experiments
  4. Google Business Profile: Tips to improve your local ranking
  5. Google Search Central: SEO Starter Guide
  6. Yandex Direct: Unified Performance Campaign (in Russian)
  7. Yandex Direct: display campaign results on the ya.ru home page (in Russian)
  8. Yandex Wordstat: help (in Russian)
  9. Yandex Business: help (in Russian)
  10. Meta Marketing API: Ad campaign reference, objective field
  11. Meta Marketing API: Split testing
  12. LinkedIn: Objective-based marketing
  13. Amazon Ads: Sponsored Products
  14. Gmail: Email sender guidelines
  15. ConsultantPlus: advertising without consent, Article 18 of the Russian Advertising Law (in Russian)
  16. FTC: CAN-SPAM Act compliance guide for business

An agency sent a lead forecast: how to tell whether to trust it

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  1. Google Ads Help: About Keyword Planner forecasts (forecasts vs historical metrics, bid ranges)
  2. Google Ads Help: Use Keyword Planner (forecast refresh)
  3. Google Ads Help: About Performance Planner (forecast data and eligibility)
  4. Google Ads Help: About Smart Bidding learning
  5. Google Ads Help: About Reach Planner (estimates, no guarantee)
  6. Google Ads Help: About forecasts in Reach Planner (default conversion rate, data window)
  7. Yandex Direct Help: Budget forecast
  8. Yandex Advertising: Budget forecast in Yandex Direct, guide in Russian (updated 19 Feb 2025)
  9. Yandex Direct Help: Campaign has few conversions (goal frequency and learning time)
  10. Meta Business Help Center: About estimated audience size
  11. Meta Business Help Center: About the learning phase
  12. Meta Marketing API: Estimated daily results, developer documentation

Marketing and sales metrics glossary for business owners

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  1. Google Ads Help: Cost-per-click (CPC): Definition
  2. Google Ads Help: Average cost-per-click (Avg. CPC): Definition
  3. Google Ads Help: Clickthrough rate (CTR): Definition
  4. Google Ads Help: Cost-per-thousand impressions (CPM): Definition
  5. Google Ads Help: Conversion rate: Definition
  6. Google Ads Help: Average CPA: Definition
  7. Google Ads Help: About Target CPA bidding
  8. Google Ads Help: About Target ROAS bidding
  9. Google Ads Help: Return on investment (ROI): Definition
  10. Google Ads Help: About conversion values
  11. Google Analytics Help: Get started with attribution
  12. Google Analytics Help: Cohort exploration
  13. Google Analytics Help: Dimensions and metrics (purchase revenue, LTV, first user source)
  14. Meta Business Help Center: CPM (cost per 1,000 impressions)
  15. Meta Business Help Center: CTR (link click-through rate)
  16. Meta Business Help Center: Cost per lead
  17. Meta Business Help Center: Purchase ROAS (return on ad spend)
  18. Yandex Direct: Glossary
  19. Yandex Direct: Revenue and conversion value
  20. Yandex Metrica: Glossary
  21. Yandex Metrica: Attribution models
  22. HubSpot Knowledge Base: Use lifecycle stages
  23. HubSpot Blog: Marketing efficiency ratio (vendor blog)
  24. Shopify: Customer acquisition cost (vendor blog, definition and cost scope only)
  25. Shopify: Average order value (vendor blog)
  26. Shopify: Customer lifetime value, CLV formulas (vendor blog)
  27. OpenStax: Principles of Accounting, Volume 2, contribution margin
  28. OpenStax: Principles of Accounting, Volume 2, return on investment, residual income and EVA
  29. Salesforce: How to calculate customer churn and revenue churn
  30. Mixpanel Docs: Retention
  31. David Skok, forEntrepreneurs: SaaS Metrics 2.0, LTV:CAC and CAC recovery guidelines (subscription companies)
  32. Wall Street Prep: CAC payback period (vendor training material, definition and formula only)

Your site is indexed but search brings no customers: what to check

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  1. Google Search Central: In-depth guide to how Google Search works
  2. Search Console Help: Page indexing report
  3. Search Console Help: URL Inspection tool
  4. Search Console Help: Performance report (Search results)
  5. Search Console Help: What are impressions, position, and clicks?
  6. Search Console Help: Why is my page missing from Google Search?
  7. Google Search Central: SEO Starter Guide
  8. Google Search Central: Do you need an SEO?
  9. Google Search Central: How to specify a canonical URL with rel="canonical" and other methods
  10. Google Search Central: AI features and your website
  11. Google Search Central Blog: Introducing Search Generative AI performance reports, June 3, 2026
  12. Bing Webmaster Guidelines
  13. Bing Webmaster Tools Help: Why is my site not in the index?
  14. Bing Webmaster Tools Help: URL inspection
  15. Bing Webmaster Tools Help: Search performance
  16. Bing Webmaster Blog: Introducing AI Performance in Bing Webmaster Tools Public Preview, February 10, 2026
  17. Yandex Webmaster Help: How Yandex Search works (in Russian)
  18. Yandex Webmaster Help: Pages in search (in Russian)
  19. Yandex Webmaster Help: Reporting new and changed pages, page recrawl (in Russian)
  20. Yandex Webmaster Help: Checking that important pages are in search (in Russian)
  21. Yandex Webmaster Help: Search query statistics (in Russian)
  22. Yandex Webmaster Help: Search query analytics and data differences (in Russian)
  23. Yandex Webmaster Help: Why duplicate pages are a problem (in Russian)
  24. Yandex Webmaster Help: Improving site positions in search (in Russian)
  25. Yandex Webmaster Help: Site visibility in Alice AI (in Russian)

How to check conversion tracking before you launch ads

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  1. Google Analytics: Monitor events in DebugView
  2. Google Analytics: About key events
  3. Google Analytics: Change the counting method of key events
  4. Google Analytics: Data filters
  5. Google Analytics: URL builders and UTM parameters
  6. Google Tag Manager: Preview and debug containers
  7. Google Tag Platform: Consent mode overview (last updated 2026-07-30)
  8. Google Tag Platform: Debug consent mode with Tag Assistant (last updated 2026-10-13)
  9. Google Ads: Create conversions from Google Analytics events
  10. Google Ads: About conversion counting options
  11. Google Ads: About auto-tagging
  12. Google Ads: About offline conversion imports
  13. Yandex Metrica: Goals (in Russian)
  14. Yandex Metrica: Tag debugger (in Russian)
  15. Yandex Metrica: Troubleshooting goals (in Russian)
  16. Yandex Metrica: Importing offline data (in Russian)
  17. Yandex Direct: Using Yandex Metrica (in Russian)
  18. Yandex Direct: Troubleshooting low conversions (in Russian)
  19. Yandex Direct: UTM tags and dynamic parameters (in Russian)
  20. Meta: Conversions API, using the API and Test Events
  21. Meta: Deduplicate Pixel and server events
  22. Meta: Verifying your Conversions API setup
  23. Meta Pixel: Standard events reference

Analytics says 120 leads, the CRM 87, the ad platform 140: which is right?

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  1. Google Analytics: About events
  2. Google Analytics: About key events
  3. Google Analytics: About key event counting method
  4. Google Analytics: Select attribution settings
  5. Google Analytics: Get started with attribution
  6. Google: About consent mode
  7. Google Analytics: Set up Analytics for a website, reporting time zone
  8. Google Ads: About conversion windows
  9. Google Ads: Data discrepancies, factors and troubleshooting
  10. Google Ads: Fix discrepancies and errors in offline conversion imports
  11. Yandex Metrica: Goals
  12. Yandex Metrica: Offline conversion data transfer and processing
  13. Yandex Direct: Statistics questions and differences with Metrica
  14. Meta: About attribution models and attribution settings
  15. Meta: About conversion count differences between Meta Ads Reporting and third-party reporting tools
  16. Meta: Differences between event counts in Ads Manager, Ads Reporting and Events Manager

Search or social: how to read attribution without cutting the wrong channel

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  1. Google Analytics: Get started with attribution
  2. Google Analytics: Select attribution settings
  3. Google Analytics: Scopes of traffic-source dimensions
  4. Google Analytics: Reporting identity
  5. Google Ads: First click, linear, time decay, and position-based attribution models are going away (April 6, 2023)
  6. Google Ads: About attribution models
  7. Google Ads: About data-driven attribution
  8. Google Ads: About Conversion Lift
  9. Yandex Metrica: attribution models and the May 20, 2026 changes (in Russian)
  10. Yandex Direct: attribution models, significant sources and windows (in Russian)
  11. Yandex Metrica: uploading offline data (in Russian)
  12. Meta: About attribution models and attribution settings
  13. Meta for Developers: Ads Insights API metric availability updates (October 16, 2025)
  14. Meta: Best practices to get started with Experiments
  15. Meta: Conversion lift percent
  16. Meta GeoLift: Walkthrough

How to check whether your sales team keeps up with incoming leads

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  1. Oldroyd J., McElheran K., Elkington D. The Short Life of Online Sales Leads. Harvard Business Review, March 2011
  2. HubSpot Knowledge Base: Create sales reports in the sales analytics suite
  3. HubSpot Knowledge Base: HubSpot's default deal properties
  4. HubSpot Knowledge Base: Create and edit sequences
  5. Kommo: Track your win-loss statistics
  6. Kommo: Create and assign tasks
  7. Kommo: Analyze calling activity
  8. Kommo: Review your team's sales performance
  9. Bitrix24 Helpdesk: Sales pipelines
  10. Bitrix24 Helpdesk: Statuses and dropdowns in CRM
  11. NIST/SEMATECH e-Handbook of Statistical Methods: Confidence intervals for proportions

How to check a landing page before you launch ads

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  1. web.dev: Web Vitals
  2. web.dev: Largest Contentful Paint (LCP)
  3. About PageSpeed Insights
  4. Google Ads: Landing page experience, definition
  5. Google Ads: About Quality Score for Search campaigns
  6. Google Ads: About ad quality
  7. Google Ads: Optimize your ads and landing pages
  8. Google Ads: Evaluate the performance of your landing pages
  9. Google Ads policy: Destination requirements
  10. Yandex Direct: ad requirements, landing page and contacts
  11. Meta: Website landing page views
  12. Meta: Understand the difference between link clicks and landing page views
  13. Meta: Advertising policy basics checklist
  14. Nielsen Norman Group: Website Forms Usability, Top 10 Recommendations (2016)
  15. Seckler et al., CHI 2014: Designing usable web forms, empirical evaluation of web form improvement guidelines
  16. Russian Federal Law on Personal Data, Article 9 (ConsultantPlus, in Russian)
  17. EDPB: Guidelines 05/2020 on consent under Regulation 2016/679