Superficial knowledge is a cause of great hurt.
Every solution breeds new problems.
You should regard it as welcome if you make a blunder in the early period of the game. A game of Go is a sequence of failures, strategy involves playing to minimize the possibility of failure. A game which begins poorly ends worse. Thinking is the same as the sleeping for weak players. A long period of pondering will not help you make progress, but you cannot become stronger without deliberation.