Hello,
There are a lot. This is a good place to start: Where to start with new phone
Also, I follow the LinMOB blog: https://linmob.net/ He has had some good tutorials and setup links from time-to-time. I find it to be a great resource for Linux Mobile, as a whole. Otherwise, the moderators and long-timers here: @FranklyFlawless, @amarok, @irvinewade to name three, are great resources.
Also, I found @Kyle_Rankin and his post to be invaluable, especially this one: My First Year of Librem 5 Convergence – Purism