List increments

Does anyone know an easy way of adding or subtracting values from a list?
If I say “add 1 to list” it merely adds another entry whose value is 1. If I say
“increment entry 3 in list” or “add 1 to entry 3 in list”, I get a compile error.

I think you’re just looking for:

Now entry 1 of L is entry 1 of L plus 1;

(Assuming L is set up as a list of numbers that varies).

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