How do you plan your projects?

Solo iOS Developer here. I’ve worked in an R&D environment before so I realize for big enterprise projects there is a lot of time and planning that must happen at the beginning. It’s the foundation that matters the most for an application that stands sturdy.

Curious as to best practises to organize myself better in terms of documentation, conceptualization and planning. I’m using Figma for creating my UI at the moment and I’m writing down the apps conceptualization/Requirements in a google docs file.

I’m not employed in my desired field of work by any means but I would imagine linking all this kind of documentation in a Github project could only serve me for the better should a recruiter decide to take a look at my work correct?