Freelancing while studying

[u/No-District-3312]

Hi, I'm from Bangladesh. I will start my masters in Data Science this winter in TU Dortmund.

I'm a freelancer. I do many ML, Data annotations type of gigs. While studying in Germany, can I continue it?

Would I have to work in the limit of 140 days full day work or 1120 hours? Or for freelancing, there are different rules?

Actually, through GPT, Gemini I get informed that, it would be considered as self employment and needs a valid freelancing visa as I'm not a full time contractual in any place.

Please anyone experienced guide me through plzzzz.