How to Enable Auto-Tagging on Google Ads
Note: Auto-tagging is an optional but recommended Google Ads feature that will automatically add a parameter to your URL that will tell Google Analytics which ad the user is coming from. This saves you the work of manually tagging each of your campaigns and saves you from potential human error while at the same time allowing for more detailed Google Analytics reports.
Go to https://ads.google.com/ and log in to your account
Click on the Google Ads logo in the top navigation:
On the sidebar click “Settings” → “Account Settings” → “Auto-tagging”
Tick “Tag the URL that people click through from my ad” → Click “Save”
That’s all! You should start seeing your Google Ads traffic information inside Google Analytics in the first 24 h after your ads have started running.