Could you put a link to lichess.org/variant somewhere on the main page? Maybe in the learn menu or the hamburger menu on the right. I've just spent about a 30 minutes trying to find descriptions of 'arena' and 'beserk' and rules for all the different variations of games. Even the variant link doesn't describe how tournaments work, or what the difference is between bullet, blitz, rapid, etc. I can't find a link anywhere that describes how these games work on lichess.