Use the Setup Assistant to finish configuring your GA4 property

Setup Assistant (not to be confused with the "GA4 Setup Assistant" wizard in your Universal Analytics property) is accessible from all GA4 properties. It provides all the settings you need to finish configuring your Google Analytics 4 property. All users can access the Setup Assistant, but you need the Editor role on the property to make any changes.

There are 7 tasks that should be reviewed and marked as complete. under 3 main topics. 

Data collection
Collect website and app data

Property settings
Turn on Google Signals
Set up conversions
Define audiences

Google Ads
(if ads are not running, these should be marked as complete)
Link to Google Ads
Bid on GA4 conversions
Target ads to GA4 audiences