When I’m helping others with their German I constantly try to put myself in their shoes to anticipate problems they might have with a certain grammar topic, words or expressions. This is easier if my student speaks English or Spanish, as I also know these languages. So most of the time I can guess what my student is trying to express or why he/she makes certain mistakes (e.g. using the sentence structure of their mother tongue) and explain it.
But of course we have German Learners from many different countries here and each and everyone is different. So I wanted to ask you guys to let me know what is/was especially difficult for you to learn? I would love to become more aware of everything you struggle with in order to help you better!