Ma vs mon use

Question

I understand both are used to indicate my, however, I’m not sure when to use one over the other

Accepted Answer

Bonjour Jane,
Ma and Mon are a couple of the terms known as possessive adjectives.
https://progress.lawlessfrench.com/my-languages/french/review/3191/1073697
The link above will take you through all the various aspects of usage and I recommend that you review the lesson in its entirety to get a thorough overview of this important aspect of French grammar.
Hope you will find this helpful,
Bonne continuation 
Jim

Answer

I would also add its worth learning the gender of nouns as you come across them. There are a number of helpful guides eg Identifying the gender of nouns by some specific word endings in French  Good luck!