How to invest in cryptocurrencies?


I would like to ask you for some tips - I am completely green in the subject of cryptocurrencies, but I would like to start my adventure with the BTC exchange. I know it's a long topic, but maybe someone could give me some valuable advice, e.g. how to predict a cryptocurrency price increase, which cryptocurrencies are best to invest in, what to observe?

I will be grateful for any hints :)