The first reply is really good.
I encourage you to install the "F-Droid Basic" app and search for apps there. Also have a look at known 3rd party repositories
There you find 99% friendly, small, efficient apps that do one thing and do it well. Also some crazy cool and complex apps like OSMAnd~, Gadgetbridge etc.
It is not easy to find privacy friendly apps on Google Play, it is full with cheap fakes or copied apps, all are full of ads, pay-to-get-basic-features etc.
There might be apps on Google Play that contain ads and trackers, while looking the same as an app on F-Droid.
Instead of F-Droid you can use Obtainium, but this has pros and cons (not reproducible builds, uncontrolled build environments, full trust in developers, ...). Just using F-Droid is fine, really. And not invasive at all.