I can do some python. And I am interested in security. How can I Combine them?

Python is very often used by hackers because it's easy and quick.

Security however is so broad that it would require more knowledge depending on the subject/target

So you can study how the python vunluaribites work!

@wiwe2210 I get that. Thanks
Suppose I always want to secure myself, like homogeneous encryption. Or may be sometimes I want to check my own website if it is secure. If it's not I want to make sure that they are secure. With all by myself.
Then where should I start?

Hackerone has a cool capture the flag on the following address https://ctf.hacker101.com/, it's a cool place to start if you are interested in security.

Recently did this at their office in Groningen.

Black Hat Python. The book.

@RememberMe that's a good one!

Get good at python, get good at security and check out a great book called violent python