Errors made in initial stage

The main problem face by most of the chess player is that they commit unrecoverable errors in the initial stages of the game. Let us discuss those errors.
First of all, it is important to remember that the most vulnerable points in the King side Defense are those protected by the king alone. In the initial position, these points are the f2 and f7 pawns; after kingside castling, they are the h2, g2, h7, and g7 pawns. Protection of these squares is of foremost importance. Experience shows that, as a rule, it is o these square that disasters occur in even the most sophisticated opening systems.