There are sound gambit and unsound ones. Some of them are easy to play and other aren't. For example don't play sth like evans gambit. Gambits which i could recommend you are: Morra gambit, Danish, Benko, 2 knights defence(sometimes is kind of a gambit), maybe Marschall Attack vs spanish(i know there are many antimarshall, but in fact u can play marschall attack anyway, despite it is less effective then, attack still will be very strong, very hard to defend)
All of these gambits are sound(maybe apart of morra gambit, but i am not sure), easier to play for your side and u should achieve at least equal positions, but defending is difficult, 1 bad move and position could collapse. Check them on wikipedia, try them and have fun:)

Most gambits provide you with some sort of advantage, usually in development (ie. open line for bishops, more pieces out, etc.) The problem is that if you don't know how to use that advantage and convert it into something you can use to win the game, it doesn't help much. So what is the best way to use the advantage from a gambit?