Is BTC and ETH the only reasonable one’s? And a few other questions

Hey,

I’m very young and very new to this space. I’d be very happy to be answered as if I were 5.

So, I’m kinda new to investing in general. Right now my portfolio is 70% in the stock market and 30% in commodities. I’d like to diversify it even more. From what I saw, ETH and BTC seem to be the more safe one’s. I’m thinking about making my portfolio 50/30/15/5 (stocks, commodities, BTC and ETH).

And just to be clear about something else, I’m supposed to have a cold wallet (a trezor hardware for example) and a hot wallet with which I can actually use my crypto. And finally an exchange like kraken to actually acquire crypto. That’s what I understood at least.

I don’t plan on buying right now, I’m still doing my research. Thank you in advance for your help!