Germany Cost & living - Part-time work

What about part-time job opportunities while studying abroad in Ireland/Germany for a Master's?

For part-time work while studying in Germany, do students need to learn German language? How is the part-time job scenario there?

What is the required level for the language test to be eligible for part-time jobs in Germany?

Are part-time job opportunities available during studies in Germany and the UK?

Is Europe a good option for PhD studies in terms of part-time job opportunities and stipend in UK/Germany?

Can I open a separate bank account in Germany as a student and do part-time jobs?

Is there a part-time job opportunity available for students and how much can one earn in a year in Germany?

Is it possible to do a one or two-year course with part-time study and work to cover expenses in Germany for a Master's?

Is it possible to do a part-time job during my studies abroad in Germany?

Are part-time job opportunities available in Germany, UK, and Ireland, and what are the allowed working hours per week for a Master's?