Black Hat Python: Python Programming for Hackers and Pentesters is worth a quick read to learn a bit about avenues of attack on networks and web services (disclaimer). The second half of the book is largely devoted to attacks on windows machines which is less useful to me professionally but still interesting.

As a data scientist I sometimes expose data through web interfaces and it’s important to understand how a malicious user might try to exploit a system to access its data or take down the service.