Generally what people in the stacker-sphere say is that they leave enough in the bank to cover their bills for a month or two and then a bit of a buffer for emergencies such as your car breaking down then the rest goes into investing.

Lately I've been thinking I should keep a bit more cash only because I have a feeling a crash is coming but it's not anything evidence based as you can't really time this stuff so I'm just going off my gut.

If you're just getting into metals consider that silver appears very undervalued (so does gold but silver is more so) so get both but maybe you'd be comfortable speculating on silver rising quite nicely and allocating more towards it (obviously do your own research and accept the risks).

As far as resources go I like these channels on youtube:

George Gammon For content about the financial system.

Palisades Gold Radio Interviews in the metals space.

Stansberry Research Interviews in the metals space.

Evidence Based Wealth (a.k.a. belangp) Some interesting but sometimes advanced or abstract concepts that I don't always follow.

I like watching videos from channels like these because they often have a philosophical tie in but also provide perspective about how to financially position yourself in ways that most normal people aren't exposed to.