A bad chess camp haunts my money...

Now somehow i convinced myself to go to this bad chesscamp. I mean why do they teach openings? every good player knows that you dont need to study chess openings a lot if you consider the folloing:

-try to gain the center like play

-put your pieces in active squares and better, outpostes!

-castle, perferabley on the kingside

and a game om the morphy book i have:

there two other good points because of snacks and 1 other good player like me