XPrivacyLua - Really simple to use privacy manager for Android 6.0 Marshmallow and later (successor of XPrivacy).
XPrivacy - The ultimate, yet easy to use, privacy manager (Xposed module).
App Ops - modifies the settings of "appops" in Android system
DNS66 - Local vpn for adblocking.
Blokada - The best ad blocker for Android. Free and open source.
Pi-hole - Pi-hole is a multi-platform, network-wide ad blocker.