How do you access a two-dimensional array?

I have the following unsolvable task. There is a list : [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
How do I move every first value in the blocks: [1, 4, 7] to another list?
please tell me in blocks...

what you mean by move? delete the first item of each sublist?

or just pick every first item of sublist and make a new list? if so we have a block named 'list by walking key path ' in dictionary drawer, like

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more descriptive name of this function:

get column x of list of list.

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