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 that this is a topic of the river, but maybe someone could give me some valuable advice, e.g. how to predict an increase in the price of cryptocurrencies, which cryptocurrencies are best to invest in, what to observe?

I will be grateful for any suggestions :)