Decide whether you want to back Michael Jordan or LeBron James as the GOAT, and then only accept information that supports your stance and ridicule anyone with a differing opinions.
Jordan is absolutely amazing, truly, but the only GOAT I acknowledge is Wilt Chamberlain. The guy put up the only unofficial quadruple quintuple double in NBA history, and only because the league didn’t track blocks and steals at that point in time. Because of him, they changed the rule for free throws to not allow slam dunks. GOAT.
A channel like Thinking Basketball will help you ease into being a fan of the game itself at a higher level. It will make it more exciting to be a fan of any team, as you’ll be able to break down what’s happening. It is normally such a blur to the untrained eye, whereby you end up ball watching instead, while most of the game actually happens off ball.
To add to that, you can generally find podcasts on your fave teams on spotify/youtube etc.
They can be a mix of entertainment and analysis, and I enjoy listening to the discussions and comparing to my own stupid takes. They often explain things around eg, trades, taxes and caps etc so that normal humans can understand it too.
Fantasy basketball is another good way to learn a little bit more about individual players and keeps you current on who is trending. Lots of sites have free leagues
I’d say start with picking a team and go from there. You don’t really need to watch old games and such; it’s not like a tv show haha, no need to catch up on previous seasons. But YouTube has everything to get you started!
I’d look up fun content like Kobe’s old Detail show or breakdowns like that if you’re interested in the actual game. 30 for 30 documentaries can really highlight some great history like you mentioned.
And of course, get yourself a ball and go out to hit some shots. Even just on your own. Nothing better than the personal connection to the game to appreciate what these guys are doing
Single best thing you can do as a beginner is dribble, dribble, dribble. Do 10 minutes of dribbling drills a day (or as often as you can) and you should see improvement very quickly. There's lots of beginner drills on youtube and you can do them anywhere (though the sound might piss your family off if you're doing it in the house or garage). Getting a confident handle opens your entire game up.
Pick a handful of teams just based on first impressions, which usually come from players that you like for their skill and/or personality. Watch a few games for each team when the season starts (or games from last season if you have access to them) and you should click with a team pretty quickly.
Consider paying for the NBA streaming service, it lets you watch as much basketball as you want. I think you can sign up by the month if you just want to use it to get up to speed and that'll give you access to all of last season's games as well as a bunch of much older ones.
A lot of people have mentioned great tips for getting into playing basketball but theres one absolutely crucial one that hasnt been mentioned yet: footwork footwork footwork. Seriously. 99% of the people you will play recreationally will have terrible footwork on offense and defense but it is absolutely fundamental. The best way to improve your footwork is to play soccer or be a dancer lol
edit; Also, do your Mikan Drills! I cant tell you how many easy smoked layups I see from people who should be better.
edit 2: Okay last addendum: The two moves that opened up my scoring more than anything are the windmill crossover and this unnamed fake-into-crossover move. The windmill crossover is not too hard to pull off but the other move is much more advanced. But it shows how you can make a huge advantage just using a little bit of footwork. Heres two great videos that break down the two moves
Play Nba2k. It really helps you learn all the players and rosters. I used to know pretty much every scrub in the NBA but since ive stopped playing I really only can remember starting lineups at best lol. You can also learn a lot about basketball plays from that game which should make watching the real game easier.