I have a realme 5 Pro. Honestly, the current state of officially and unofficially supported custom ROM for rmx1971 suck. PixelExperience was the last decent half-decent ROM for my device - it had some battery issues. DerpFest, crDroid and EvolutionX are all terrible for me - because I never wanted those "fancy" settings in the first place.
Right now, I'm on DerpFest, and honestly, it's terrible. The desktop and wallpaper engine is broken, the theming is all over the place and some of the contents are out of the screen. Honestly, I want something that is as close to the stock ROM, is lightweight, and gives life to older devices. LOS seems to be a good ROM, at least from the YouTube videos I've seen.
How should I go about creating a build for my device? And what should I care about while building? And how can I make my build official later on? What about the kernel? Can it be updated beyond the version that's it at right now?
The fact that there's other custom ROMs already available for the device is a great starting point. I'd try asking the maintainers of the current ROMs for some pointers.
I wish I wasn't exaggerating, but they're (folks in Telegram for my particular device) not the most friendly bunch. This is why I was looking for a generic tutorial to try my own hands on.
Yeah, their friendliness is the only reason I have not tried once in over a decade.
Toxicity kills software.