relevant posts on reddit

Open:

https://old.reddit.com/r/Physics/comments/8vurwq/derivation_for_dummies_a_quick_guide_to_one_of/

Closed:

https://old.reddit.com/r/Physics/comments/725dz1/keeping_track_of_derivations/

https://old.reddit.com/r/Physics/comments/1v0wap/derivations_of_equations/

https://old.reddit.com/r/Physics/comments/1c7uas/derivation_of_the_schrodinger_equation_in_under/

https://old.reddit.com/r/Physics/comments/7y9gkz/are_derivations_worth_it/