dropshipping guide

Hi all, This is prob' the most noobiest question, but I'm gonna ask it anyway. I've been providing programming and website building services for a while now working as a freelancer, and as any digital entrepreneur heard a lot about dropshipping... Can anyone (with experience) tell me what is...

I have been studying droppishipping for some time, but I have not put it into practice because I have many doubts and some "fear". I'm in Brazil, and I do not see great digital marketing opportunities around here, can anyone giving dropshipping outside Brazil give me some tips?