Next time, try to use the search function for a question like yours. Without trying I found 2 posts via the search function for edo roshi: https://forum-narutoen.oasgames.com/page/search-thread?data=Roshi

but non of them say much stuff tho...

I don't know what you are looking for but these two posts should should be enough for knowing about Edo Roshi:

1) https://forum-narutoen.oasgames.com/page/show-post-32313-1.html - a basic explanation for him, the pros and cons, and basic lineups before his intro to breakthroughs

2) https://forum-narutoen.oasgames.com/page/show-post-43150-1.html - talking about the breakthroughs, which one you should use, lineups etc.

And if this is what you are looking for, maybe try harder in your search?