Once a project has more than one file, give it a clear shape so anything is easy to find:

my_project/
  main.py            the entry point you run
  helpers.py         supporting functions
  data/
    students.csv     data files
  README.md          what the project is and how to run it
  .venv/             the virtual environment (not shared)

A few habits that pay off:

• Keep code and data in separate places.
• Put a short README so you (and others) remember how to run it.
• One job per file — don't pile everything into main.py.

Good structure is a kindness to your future self, who won't remember today's details.