> It is possible to learn German but it requires huge effort and dedication and not many people are capable of that.

Actually I'm german and I think to learn every bits of our language takes a huge effort. I mean we maybe don't have so many Characters like the Chinese ones. But our huge rules of grammar and special word cases makes it ridicoulus. And then there is the "Neue deutsche Rechtschreibung", which of course some things were reversed in the last years.

Basically when just ignoring all those stuff you are probably understood by the most people here even if they will likely try to correct you but I guess except a few there aren't much people that really know how to correctly use the language as a whole.