Irrespective of the reason for which you want to migrate to Germany, there are certain eligibility requirements that you should meet:
Financial stability: Certain financial requirements will have to be met as proof that you can financially support yourself while in Germany. If you are coming to Germany with a job offer, you still need the initial funds to meet expenses until you get your first salary.
Health insurance: It’s mandatory to have health insurance coverage before you migrate to the country.
Basic proficiency in German: You will need basic proficiency, generally B1 level, in German. C1 or C2 level proficiency will be needed for permanent residence in Germany.