Fandom is the 'Wikipedia of pop culture,' but it's owned by a corporation that loves ad revenue more than user experience. It’s an incredible resource for kids who are deep in a 'hyper-fixation' phase with a specific game or show, but the interface is a disaster zone of pop-ups and auto-playing videos.
If your kid is looking for info on a major game like Minecraft or Zelda, look for the independent wikis first. Many of the best communities have actually left Fandom to start their own cleaner, ad-free sites. Use Fandom as a backup, and maybe install a solid ad-blocker before you let them loose on it.

