The Federal Office for Information Security (BSI) recommends that every user carries out the following anti-phishing training – the GITZ can only endorse this recommendation:
SECUSO Anti-Phishing Training (online).
There is also an information video on the subject of phishing from the SECUSO research group at KIT: Anti-phishing video from SECUSO
The SECUSO research group has also written a self-study seminar on anti-phishing. Here you can continue your education on your own:
In Germany, an interdisciplinary association of scientists from the Ruhr University Bochum has taken on the phishing problem. The “Working Group on Identity Abuse on the Internet” (A-I3) not only provides up-to-date information on IT security issues on its online portal, but also concrete assistance and tools: https://www.a-i3.org/.
Here you can test whether your e-mail address appears in one of the beacnned data leaks/hacks: