Lists of my favorites:
NetGuard - Great for a complete device lockdown to block all internet access for all apps and can whitelost certain apps. Has good logs and alerts for apps attempting to connect to internet. It does have premium features you can bypass with Lucky Patcher if you don't wanna pay.
Blokada - Great for just blocking trackers. Has alerts for trackers and logs.
App Snitch - Good logs on snitching out apps, BUT contains trackers in app!
Hope I answered right.