What is the best technique in the stock market?

The answer REALLY DEPENDS on your timeframe.

On one extreme, you have day trading that plays news related price moves, momentum stocks, gap up/down, earnings, etc.

In the middle is more short-term (swing) trading, holding stocks for weeks & months (what I do).

On the other extreme is buy-and-hold long term investing that is for 10+ years.

There is no best technique, each strategy has an advantage and disadvantage. Everyone will have their favorites.