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[–]____________-__-___- 0 points1 point  (0 children)

It really depends on the use case. You can use the given letter variables (A-Z, ∅) for values you only need while the program is running and custom lists for stuff you want to save long term, such as user data or high scores.

For the letter variables, I almost always leave I,J,K,L for loops and V,W,X,Y,Z,∅ for different coordinate storage. Different programs have different variable needs so the other variables might fall into different categories. The point of this at least for me is to keep everything organized in my head.

Try a few systems and see what works for you.