i would go one step further, not only is there a lack of centralized content on how to play comp, but the actual funnel for recruiting (and retaining) new players is lacking. rgl does a pretty good job of marketing the league if you happen to be watching one of its streams, but put yourself in the shoes of a total noob: okay, you see an ad for rgl, you go to the site. there's nothing on this front page that, as someone who has never played comp, is intuitive or holds your hand through the steps of how to find a team, how to learn this new format, how to find newbie pugs or scrims and begin practicing, etc. these things are all completely foreign to someone not in this community and i'd wager that there are plenty of potential new players that stop before they even start because they don't know what to do or how to do it. an introductory beginner video or a guide or some sort that clearly walks players through this process should be prominently on the front page and easily accessible, and then there should be a clear funnel to step by step get someone signed up and start the process of getting them involved and engaged with learning and finding a team.
regarding educational content, rgl's youtube posted soapy reviewing a pov. a series like this has a lot of potential and should be followed up on with other players/classes/maps, and even more importantly at a lower introductory level. there are some callout vids for maps which are good as well, but again this content needs to be expanded on and centralized and more easily accessible.
(on a smaller note, there also needs to be a clearer incentive than "do you want to play comp tf2? check out rgl.gg". this will get the attention of a portion of the pub/casual player base that is competitively inclined and looking for something more challenging, but there are other reasons someone might want to start playing comp- making new friends, being part of a community, getting better at the game, and so on.)
finally, ya'll need to work on that SEO. when you search "competitive tf2" rgl doesn't even show up on the front page of google, same with "how to play competitive tf2", where the most helpful resource is this sorta boring wiki article. if you search for "tf2 league" the first result is UGC.
there are multiple weak links in this chain of recruiting, educating, and retaining new players and if u want the comp scene to thrive into the future it's one of the most important things to focus on.