(I'm not actually new even thought I look it).
There aren't any important forum links except for maybe Muli's userscript (an awesome addon):https://www.warlight.net/Forum/106092-tidy-up-dashboard-2
Clan wars aren't offically a feature however we do have inter-clan battles set up between two clans privately, and Clan League, which is clans seperated into divisions squaring off for top rank.
Only public tournaments need to be payed for, private tourneys are free and you can create a certain number at a time depending on your level and whether you have a membership.
And Cacao is a troll, ignore him, but he was referencing Hitler's early life.