Thank you for these answers. It's very hard to guess what a good starting point is before you already have a decent foundation on a subject. And I did indeed google 'mathematical skills for relativity' without differentiating between general and special relativity. Seems like I can already jump...
Summarized: Which mathematical fields should you focus on if your goal is to gain a better understanding of relativity and related subjects?
(My apologies if there are already other threads asking this question, but 'math' and 'relativity' aren't really useful search terms on this forum.)
Hi...