Your qualifications - whether a degree or job experience from your home country - need to be recognised in Germany before you start job hunting. Find out more about the recognition of foreign certificates in the chapter Recognition. If you do not have a formal degree but have extensive experience in a profession, you can have your qualifications checked. You will find qualification tests in English for various jobs at https://www.meine-berufserfahrung.de/.
These tests reveal where you stand professionally. You can take your test result to the Jobcentre and do another longer, more comprehensive test there (https://www.myskills.de/). This second test enables the Jobcentre and potential employers to better assess your skills and experience and helps you find a job that matches your qualifications. You can also start advanced training ("Weiterbildung") based on your current knowledge and skills.