Welcome back!
Just a few days ago I was refreshing my daily-wear T-shirt stash and I came across the Dog Island Investment Co shirt that I got at the MI convention in Las Vegas.

What posts should I look for, as a starting point to catch up on what's going on here?

Go back about to about 2022 and read forward. You can skip the "what's happening now" and "portfolio/screen updates" & "Rankings" posts.

(Oh crap, I just realized that this board started in December 2022.) It'll take a while to skip 5500 posts.

The best would be the longest threads, but the thread message count doesn't show up in the board index page.

You know some of the prolific names, that might be a good place to start to get up to speed fast. Find a familiar name on a post and click on the name and peruse the titles of the posts and then read the entire thread of the ones that sound interesting.
Yeah, don't forget Mungofitch.

20 years. That takes you back to 2006. Which happens to be the year I retired from Motorola and began my post-w*rking investing. Time flies.