Is this new defacto active main? tons of forks but not seeing many commits over this one

yes - I'm years and years late to this party but wanting to start somehwere to learn and got all lost with all the forks here on nomp. What is the latest main branch to use? Seems most are forks of forks and no one making PR to push code up to main repos... divergent things going on and not well documented on changes so I am lost.. as are others I am reading.

Where should I start?