What LEGO investing topics are actually useful? I'm working on some articles for the users of my portfolio tracker.

looking for advice on article topics for my portfolio tracker site (bricktracker.net). quick context first: i posted here about the site 27 days ago and got dunked appropriately on the AI flavor of my writing. I've been working on fixing some of the bugs that were pointed out since then. dialing in resale values, current deal prices, upgrading the portfolio dashboard, etc. now I'm thinking about adding some how-to's and what-to-watch-for articles for the users. Mostly because since I launched...