Just a quick hint: Mike Kuketz released a blog post about how you can use Blokada to block ads and trackers on your android device. In his post, he explains how Blokada uses a private VPN to block DNS requests to known tracker/ad sites and recommends a set of rules to configure the app for best experience.
He also briefly mentions F-Droid and gives some arguments, why you should get your apps from there instead of the Play Store.
The blog post is written in German and is available on kuketz-blog.de.