What is the best way to find a community on which to post something?

Sometimes, I want to post something and I wonder "what is the right community for this?". I know about lemmyverse.net but I feel like mobile apps (android in my case) need some sort of "community list", so we can easily browse/search for the appropriate community.

I am currently using Eternity/Boost, and neither seem to have that. Or am I missing it somehow?

I find that this is one of the main issues of lemmy/federation.