Programming for ML with no experience — if you can type, you can begin
A ruler starts at 0. Nobody finds that strange: the very first mark on the tape is 0, the next is 1, and the numbers climb from there in order. Python numbers the positions inside a list the same way. The first item in a list sits at position 0, not position 1, because Python is reading the list the way you would read a ruler, from its first mark onward.
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▶ Indexing & Slicing