The more widely-circulated Star Wars movie leaks actually turned out correct. The plot layouts for Both 7 and 9 were known long before the movies released. There were a few fake ones, but the legit ones had a lot of verification backing them up. There were a few minor changes with 9's leaks due to the reshoots, though this mostly only slightly affected the order of some scenes and a Kylo Ren scene near the end. The basic plot layout remained largely consistent with the leaks though. They did better at keeping Last Jedi's plot secret. That didn't accurately leak until shortly before release IIRC. There were plenty of fake ones, but there was no real consistency across them and everyone was pretty skeptical due to non-verified inconsistent sourcing.
The Star Wars Leaks subreddit is generally a good source for credible rumors about the franchise. Youtube is not, and everyone knows to avoid it unless they're just directly copying credible rumors off the leaks subreddit. There's a group of prominent youtube clickbaiters who constantly post nothing but easily proved wrong BS about the franchise. I've already mentioned people like ClownfishTV, Yellowflash, The Quartering etc earlier in this thread (though their content isn't exclusive to Star Wars). There are plenty of others as well.
The biggest Star Wars BSer out there is definitely Mike Zeroh. He's so full of crap that I could make a career as a credible insider simply by saying the opposite of whatever he does. Not a month has gone by over the past two years where he hasn't posted multiple videos claiming that Kathleen Kennedy has been fired. He makes 25-30 videos a week about fake Star Wars news. Much of it provably wrong from the start. His favorite piece of fake news for the past few months has been a Mace Windu show he pulled out of his rear but claims is in development. He makes a decent living off this scam. He has a continually growing subscriber count. Over 234,000 subs currently with many videos getting tens of thousands of views per day (a couple from the past week have even gotten 100,000-200,000 views).
The people posting rumors on this board at the very least aren't doing so for financial gain.