Go get some training!
Seriously, semi-educated is a BAD state to be in for firearms knowledge...just enough to be dangerous.
As for which system is better, it is mostly a matter of personal preference and intended use.
Personally, I like Single Action pistols (with a frame mounted "down=fire" safety, like the 1911). They offer a consistent, light, short trigger pull. For me, that helps reduce the effects of less-than-perfect trigger control on my part.
DAO pistols keep the advantage of a consistent pull, but are longer and heavier. Some people like this for carry applications, because a heavier, longer pull makes a negligent discharge slightly tougher. (NEVER rely on the trigger weight as a primary safety.)
DA/SA pistols lose the consistency, but keep the longer, heavier pull for the first shot (which some view as an advantage). They also go to a shorter, lighter pull after being cocked/shot. The SA pull is generally considered easier for most people to be accurate with. Personally, I do not favor this system, because I dislike having inconsistent trigger pulls. Yet, many people like them, for the reasons mentioned above.
Some striker-fired pistols are a bit between DAO and SAO pistols. Often, the striker is partially cocked. The trigger pull fully cocks, then releases the striker. This results in a pistol that has a relatively light trigger pull, but has some added safety (in that the striker is not fully cocked before trigger pull). The main benefit of this system, in my opinion, is a consistent trigger pull that is lighter than most DAO pistols.