The recommended routine from the bodyweightfitness subreddit is aptly named: https://www.reddit.com/r/bodyweightfitness/wiki/kb/recommend...

Not an expert here, but this is what I do and enjoy: you need just 4 exercises: push, pull, legs, abs.

Push: work towards 1 arm, 1 leg pushups

Pull: pullups on a bar (not chinups) Some people can do a 1 arm pullup but I'm far from that.

Legs: work towards pistol ups (=1 leg squads)

Abs: ab roller and/or leg ups with feet touching top of bar

The first 3 are the top of their class. For abs you can choose from a lot of different ones (dragon flag etc.)

I'm getting older (41), so I shifted from 3 times a week going all out, to every day training while not pushing myself to the extreme.