Refactor Froms

[Marcel583]

Description

This PR deletes unused functions and fixes the documentation in from files.

Checklist:

• [x] I have performed a self-review of my own code
  • [x] The code provides good readability and maintainability s.t. it fulfills best practices like talking code, modularity, ...
  • [x] The chosen implementation is not more complex than it has to be
  • [x] My code should work as intended and no side effects occur (e.g. memory leaks)
  • [x] The doc comments fit our style guide
  • [x] I have credited related sources if needed