I do understand English very well, but still use subtitles in case the audio is muffled etc. When speaking I have a bit more trouble remembering certain terms and mangle grammar which i realize a second later. There are some terms or phrases that I haven't encountered yet, had to have my american coworker explain some of those. In terms of being able to communicate it is totally fine but there is still friction that i feel coming from not only the language but our different backgrounds.
I also notice it is easy to learn a more niche word with the wrong pronunciation, or one that doesn't fit with the rest of what we learned. We basically end up with a mix of british and american english with random accents.
Users (and I think Discord too) call the communities servers, and channels are the individual topics/threads in a community. It might not make sense from a hosting perspective but people do call it that