To track changes to records in your CRM, you can enable Field History Tracking on up to 20 fields per object. Follow the steps below to enable this feature and select the fields you wish to track.
Go into Setup > Object Manager and select the object
Go to Fields & Relationships in the left pane
Click the Set History Tracking button
Check 'Enable Contact History'
Choose the fields you want to track changes on. You can select up to 20 standard and custom fields per object
Click Save
Currently, it is not possible to track changes on the following types of fields:
Formula fields, roll-up summary, auto-number fields
Created By and Last Modified By
Fields that have the AI Prediction checkbox selected
After enabling this feature, any updates to those selected fields will be tracked. Changes that were made prior to enabling Field History Tracking will not be tracked (i.e. it is not retroactive).
Adding Object History Related List to Page Layouts
Once Field History Tracking is enabled, do the following for all page layouts on that object.
Go to Setup > Object Manager > select the object > Page Layouts
Click on a page layout
Drag the '[Object Name] History' related list onto the page layout below in the Related Lists section, then click Save
For example, if Field History Tracking was enabled for the Property object, then the related list 'Property History' would be selected and added onto the layout.
Report on Field History Data
When you enable Field History Tracking on an object, a new report type called '[Object] History' becomes available. To view field history, create a new report based on the new report type.
For example, if you've enabled Field History Tracking on Deal Pipeline, then you would go to the Reports tab and click New to create a new report, then choose 'Deal Pipeline History' as the report type.