It is fragmented.
The PostMarketOS community is active, but more importantly, there is a ton of wiki info not only on installing, but figuring out drivers, info on partition slots, etc. Armbian is another place to read.
The other thing to learn about is the DEs, specifically phosh, gnome mobile, plasma mobile, xmso, lomiri, etc. They all behave differently, so you'll want to check out each one to see if you lean more one way or the other.
Good luck. May your journey be better than mine.
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