I'll just add to what others have already provided.

  - "Black Hat Go" - https://nostarch.com/blackhatgo  
  - "Black Hat Python" - https://nostarch.com/blackhatpython  
  - "Web Security for Developers" - https://nostarch.com  /websecurity  
  - "Cracking Codes with Python" - https://nostarch.com/crackingcodes

Highly recommend those NoStarch books. Of course, depends what you want to pentest, but this is good general information to get started.