On the store page for a game, right side, about 1 page down, steam lists how many players, and under that, controller support (among other things). Start there. This is a VR forum, assume every VR game does not support x-box and KB/m and you'll be right 98% of the time. If you want to explore those edge cases, best to search/ask in the forum for the game. On the bottom of the store page is a system requirements section, with more VR support details.