I know some people (particularly grandmasters) that said that learning an opening repertoire is better than playing a lot of different openings because you can learn from your mistakes when playing the same opening more easily. Also, you are less likely to make the same mistake over and over if you have an opening repertoire.
However, there are other people that will play any opening and believe that learning any openings generally is good as well. The downside to doing this is that you are likely to make more mistakes in the opening phase.
My question is, which is better; to have an opening repertoire or to play any opening for the average club player (1500-2000 rated)?
Having opening repertoire. Because it is a mistake to play an opening without learning it fully.
You have to know your openings well, you have to know where the pieces belong in the middlegame, the typical motifs, the pawn structures, the typical endgames. That's paramount.
Play the same openings all the time. For example Fischer played King's Indian defence 1 d4 Nf6 2 c4 g6 3 Nc3 g6 and Sicilian Najdorf 1 e4 c5 2 Nf3 d6 3 d4 cxd4 4 Nxd4 Nf6 5 Nc3 a6 with black and Ruy Lopez 1 e4 e5 2 Nf3 Nc6 3 Bb5 with white almost his whole career.
Once you are a grandmaster and all your games get published and all your opponents start to prepare against you, you may still play the same openings, as you know more about these from your experience and analysis than they can prepare overnight, but you can also play another opening as a surprise, which happens a lot in matches between two prepared top players.
Have a repertoire. When it gets deep enough, you generally get a winning edge in the first 20 moves.
I have my own self created openings which do quite well
That's simply impossible.
Can you mention some of them ?
Considering the long history of chess, the mind-boggling amount of studies and analyses that have been performed over the centuries about this amazing game (which are many more than in any other game) and the deep knowledge that has been reached thanks to contributions given by amateurs as well as by outright geniuses in both theoretical analysis and practical experience on the chessboard, I dare say that at this time of chess history it's extremely hard to invent a brand new opening or even to create an unknown variant to some opening that already exists.
I meant singular form how about this one? (lengthy yt video enjoy dissing it)
www.youtube.com/watch?v=FvI8ASwMpSg