What happens when intermediate players go against fundamental openings.

I know I am not a big chess player but still I am writing this blog to show you how intermediate players loose while trying to experiment with openings.
Here my opponent decides to play King's Gambit and is immediately punished for not knowing the proper lines.
Moral here is that in intermediate stages of chess, players should play strong fundamental openings rather than going for flashy gambits, gambits are good but they are risky and are like a double edged sword, you may go on to win if events turn out to be in your favor but what are the chances of that? so stick to fundamentals and keep chessing.