Kann jeder als Sicherheitsexperte arbeiten?

The term "security expert" is not a precisely defined job title, so you do not need any special training or continuing education, further training to be able to call yourself one. The situation is different with the title "Safety Specialist", which cannot be used without passing the Federal Professional Examination (FPE). However, you should only call yourself an expert if you actually are one, otherwise you will quickly realize that fake know-how will not bring you long-term success. It is therefore best to start with either a certificate course in the relevant specialist field or continuing education, further training if you are already employed in security/security/IT security etc.