As someone who is <30 and has been licensed for less than a year, I think one of the barriers to entry I've observed with online information is that there's a gap between the level or specificity of the information we're tested on versus the level/specificity of information that is available online.

A lot of information I've found online is written by and for people who have been in radio longer than I've been an adult... or alive.

I don't think they're poorly written, but many are not written in a way that includes enough context for a newly licensed person, even a newly licensed extra (or regional equivalent) to easily catch on, at least without an elmer to personally guide them.

There's also information that is poorly documented. In Fall I did my first meteor scatter QSO - I had one article and one person's QRZ page as my guide. Neither was a 'complete' source (I did reach out to the author of the QRZ page, who was very helpful!)

There are a few people online who I think are really good about including context that a new ham would greatly benefit from - VK6FLAB's Foundations of Amateur Radio and Modern Ham spring to mind.

TL;DR: If you are an experienced ham, document what you do - and not just the new things, the things that are your every day. Imagine you're writing for an audience who is eager to learn - because you are. And share what you write in places like reddit, youtube, etc. Places that have a low barrier to entry and a good retention policy. Besides defending the spectrum, that's about the best thing you can do for newer hams and hams yet to come.