I know maybe a little bit about bitcoin right now, I haven't bought any yet.
so why not start now? buy some with money that you are willing to invest. it doesn't have to be a couple of thousands of dollars, it can be 10 bucks!
All I've done is play some stupid gambling games like pocketdice ( fuck that ).
gambling is a game, so you do it to have fun and as entertainment not to make money. if you think of it that way, it is no longer stupid. and the same thing i said above is true here. play with money you are ok with playing.
who are pros at this business... As a newbie, how should I start it? Should I buy BTC and just hold it? Is there any trustful and safe ways to profit it?
i don't know what you mean by "business" bitcoin is a currency that you can use just like any other currency with many additional perks such as decentralization and security and also low fees and fast transactions.
and since this currency is still growing, the price of it is growing too, and makes it also an investment.
safe ways of buying it, is to go to a trusted exchange service and buy there. places like coinbase, bitstamp, kraken, bitfinex
Is investing in cloudmining like Genesis a good thing?
obviously no