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I have been using Mathematica for about 2 years and I'm pretty ok to write and optimize my code. Wanting to improve my practice, I often look at code examples. However, I can not determine if there is a "good way to do" with the use of functions Clear, ClearAll and other related functions. I note that several people clear all at the beginning of each code, while other clear only the variables. So what would be a good practice?

I have been using Mathematica for about 2 years and I'm pretty ok to write and optimize my code. Wanting to improve my practice, I often look at code examples. However, I can not determine if there is a "good way to do" with the use of functions Clear, ClearAll and other related functions (as Remove). I note that several people clear all at the beginning of each code, while other clear only the variables. So what would be a good practice?