Though they could document what they do or learn with brief posts that are not technically deep but still provide value to those learning. Even sharing one link is sometimes enough to provide value to others. Long form is not required.

Also, writing is a skill. The more you write the better. That means you will sometimes write shit. Thankfully, you can go back and rewrite your early work when your skills improve.

I normally write short posts and then revise them afterwards as many times as required. In fact, I edited this post to add more info.