The Internet is truly the best info skill, which is why it is SSS rank... So there are many rules to follow as a result 😊
The most important rule is "Rule 34", which you have to look up before anything else
I'm not sure it's really such a useful skill when you are in a fantasy world with no relation to earth. No wonder it is so far below g that it has three s's~
Geography, history, flora, fauna, mineralogoy, etc. aside, luckily the internet does have some useful knowledge even in another world. Stuff like the mechanics branch of science should still work (though unknown how far their world has already gotten), primitive tech/survivalism for when stranded in a forest (doesn't magic already solve all but the shelter part of "water, fire and shelter"? And is shelter not obsolete as monsters finds you when you are sleeping?), or inspiration.
the synopsis implies a strategy guide too, but the strategies ppl use in games are rarely things you can implement in reality. Even in games, they are usually something you fail at first try.