Fixed a few typos, and also improved formatting (I hope).
On style: I've removed the span with text decoration of underlining, as it didn't really work (in Github UI, on Chromium at least), and it's more idiomatic MarkDown to use something like emphasis, I think.
Remaining questions:
I'm not sure I got the meaning and right replacement for this initial ambiguous phrase: "Next to the homework exercises, you can find of them on the internet. By searching for them take their prior knowledge in advance."
"going through them again together is a good practise" - I'm not sure if here it would be better "practice" (the noun), or if it's ok like it is now ("practise", like in the verb)
Fixed a few typos, and also improved formatting (I hope).
On style: I've removed the span with text decoration of underlining, as it didn't really work (in Github UI, on Chromium at least), and it's more idiomatic MarkDown to use something like emphasis, I think.
Remaining questions: