You can use ANY caching plugin you want, EXCLUDING wpForo PAGE (the one with the shortcode).

For me the best is Fastest Cache, still you are free to search.....

I seen wpForo using already a caching system that's awesome but what if i wanna add a cache to my wordpress site ? what caching system you using so they don't interrupt each other or it's better go without a cache system ? i wanna speedup my website.

what cache stack is ur favorite what works good. Im using GeneratePress Theme + wpForo.