If you want to know if an app works, you can start here: https://plexus.techlore.tech/ Still a young project so contributions are welcomed!

If you don't have a Pixel like me, you can check out: https://e.foundation/ Runs since 3 years on my Fairphone 3 and gets better with every update

What distros are used? Is there a good Indian distro?

I use /e/OS since 2-3 years on my Fairphone 3 and never looked back. Best is to just buy a phone directly from https://murena.com/ . You support the project and can be sure that the phone is supported for a longer period of time.