There is a lot of great advice in here especially for someone who knows nothing about Crypto. It is to easy to hop see 1000s of different coins and just pick one and hope for the best without doing any research. (I've been guilty of that myself).

Diversification is also really important in my opinion. As you pointed out we shouldn't invest any money that can't lose. However, if you diversify than at least you are less likely to lose it all, or lose it all at once!