3
Just some beginner developer
(lemmy.ml)
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
Matrix space | forum | IRC
F-Droid is just a front end for repositories so there are a few ways you can list an app on it - mainly by hosting your own repo or contributing to an existing one.
If you go into F-Droid -> Settings -> Repositories you can see what repos are already configured. Most major repos will have a guide for how to contribute, and this is the F-Droid official repo guide.