for a vm yes, but depending on the game you can just firejail and block internet access

depends on the source, but generally no, run the game in a vm or container

spend more time in the shell. you will naturally learn the most commonly used commands and useful flags for them. soon you will be surprised by how much you know. having good typing speed helps reduce the friction a lot. i have not found need to specifically “memorize” anything consciously.

for obscure things, write a script and put it in a scripts folder, have a comment at the top explaining what it does for reference later.

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