02-12-2018
Welcome to the forum.
Please tell us which question you want answered: the one in the title, or the one in the text? It would help if title and text were consistent...
There are many techniques out there pretending to help / teach you how to memorize even the most abstract things. From my perspective, experience is best, i.e. using / applying relevant commands again and again, best in different contexts, until you master a broad set of different helpers for different problems.
For the importance of commands, I can't help you, as this is dependent on the environment and the type of task(s), and it can change on a daily basis. Its best not to memoriize just the "important" subset commands but to master a broad set of different tools.
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