my grandfather didn't fight the nazis in world war 2 so I could play in safe modepic.twitter.com/71jylFQz7J
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It's a default, low-spec mode you can boot the game in if something happens where you break the game's settings somehow.
Like if you screw up the resolution so the game doesn't fit on the screen or just boots to a black screen or something like that.
From what I've experienced, safe mode is kinda like a backup incase you somehow screwed up the game's settings (like setting them too high).
Usually where all mods are turned off to my understanding.
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