Do you like the look of this opening?

Is this good or bad? Provide your reasoning. 

I've edited the opening in the viewer, so it is worth you look again at the opening because I've just edited it.

I don't like kings gambit

However not many people know it so that good

I need a good strong player to give me some advice!

Well I am not a good or strong player but I loaded this position in an analysis board and it show s that the position is completely lost for white. This is because by playing the kings gambit, you are moving the f - pawn and greatly weakening your king side. You have also allowed your opponent to start an attack with their pawns. Because of your weak king side , you cannot short castle. I hope this helps.

Thank you.

Black is actually completely winning in this position! The engine evaluates it at -5.63 (if you want to read more about what engine evaluations mean, go here).

Black is just going to play 5...hxg4, at which point they're up two pawns and threatening the knight. White can play 6. Ne5, threatening the g4-pawn, but Black can just defend it with 6...Nh6 (after which 7. Nxg4 Nxg4 8. Qxg4 doesn't work because Black has 8...d5, with a double attack on the queen and the bishop). 

A further problem is that White's king is awfully exposed. White certainly isn't going to castle kingside (because there are no pawns to protect the king there!), and castling queenside is going to take a while. 

The King's Gambit itself is fine at amateur level (anyone below 2000 - myself included - is probably going to struggle against a well-prepared opponent who plays it). But 4. g4?? isn't a good move at all: the engine recommends 4. d4, 4. Bc4, or even 4. h4 as alternatives. 

Why does a weakened kingside prevent short castling?

Well, you're still *allowed* to castle that way if you want. It would just be very foolish, because your king would have no defenders and could be attacked very easily!