Certificates are important for school, study and work. They show what you have already learned or done. For example, you decide whether to get a job or to be admitted to a school or university.
Do you have a foreign degree, for example from school, study or training, you should have this degree recognized in Germany.
Let us advise you:https://www.iq-netzwerk-sh.de/angebote/beratung/
Different competent authorities are responsible for the recognition depending on their professional or school qualifications. The competent authority can be found here:
Universities themselves check their foreign school certificates.