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| About Analytics sessions | https://support.google.com/analytics/answer/9191807 |
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| Next: [GA4] Understand user metrics | https://support.google.com/analytics/answer/12253918?hl=en&ref_topic=11151952 |
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| Dimensions and metrics | https://support.google.com/analytics/topic/11151952?hl=en&ref_topic=9228654 |
| Analytics dimensions and metrics | https://support.google.com/analytics/answer/9191807 |
| Dimensions and metrics introduction | https://support.google.com/analytics/answer/13947485?hl=en&ref_topic=11151952 |
| [GA4] Predefined user dimensions | https://support.google.com/analytics/answer/9268042?hl=en&ref_topic=11151952 |
| Custom dimensions and metrics | https://support.google.com/analytics/answer/9191807 |
| [GA4] About custom dimensions and metrics | https://support.google.com/analytics/answer/14240153?hl=en&ref_topic=11151952 |
| [GA4] Create user-scoped custom dimensions | https://support.google.com/analytics/answer/14239618?hl=en&ref_topic=11151952 |
| [GA4] Create event-scoped custom dimensions | https://support.google.com/analytics/answer/14239696?hl=en&ref_topic=11151952 |
| [GA4] Create item-scoped custom dimensions | https://support.google.com/analytics/answer/14239695?hl=en&ref_topic=11151952 |
| [GA4] Create custom metrics | https://support.google.com/analytics/answer/14239619?hl=en&ref_topic=11151952 |
| [GA4] Create calculated metrics | https://support.google.com/analytics/answer/14166471?hl=en&ref_topic=11151952 |
| [GA4] Archive custom dimensions and metrics | https://support.google.com/analytics/answer/12436143?hl=en&ref_topic=11151952 |
| Traffic-source dimensions | https://support.google.com/analytics/answer/9191807 |
| About traffic-source dimensions | https://support.google.com/analytics/answer/15612152?hl=en&ref_topic=11151952 |
| Traffic-source dimensions, manual tagging, and auto-tagging | https://support.google.com/analytics/answer/11242870?hl=en&ref_topic=11151952 |
| Scopes of traffic-source dimensions | https://support.google.com/analytics/answer/11080067?hl=en&ref_topic=11151952 |
| Campaigns and traffic sources | https://support.google.com/analytics/answer/11242841?hl=en&ref_topic=11151952 |
| Default channel group | https://support.google.com/analytics/answer/9756891?hl=en&ref_topic=11151952 |
| Custom channel groups | https://support.google.com/analytics/answer/13051316?hl=en&ref_topic=11151952 |
| [GA4] Understand (direct) / (none) traffic | https://support.google.com/analytics/answer/15258820?hl=en&ref_topic=11151952 |
| Traffic-source dimensions | https://support.google.com/analytics/answer/15567068?hl=en&ref_topic=11151952 |
| About aggregate identifiers | https://support.google.com/analytics/answer/16479993?hl=en&ref_topic=11151952 |
| [GA4] Collect data about your users | https://support.google.com/analytics/answer/12370404?hl=en&ref_topic=11151952 |
| About Analytics sessions | https://support.google.com/analytics/answer/9191807 |
| [GA4] Understand user metrics | https://support.google.com/analytics/answer/12253918?hl=en&ref_topic=11151952 |
| User engagement | https://support.google.com/analytics/answer/11109416?hl=en&ref_topic=11151952 |
| [GA4] Engagement rate and bounce rate | https://support.google.com/analytics/answer/12195621?hl=en&ref_topic=11151952 |
| [GA4] Create content groups | https://support.google.com/analytics/answer/11523339?hl=en&ref_topic=11151952 |
| [GA4] Differences in user counts | https://support.google.com/analytics/answer/9408920?hl=en&ref_topic=11151952 |
| [GA4] Cookie usage on websites | https://support.google.com/analytics/answer/11397207?hl=en&ref_topic=11151952 |
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