A technique is a method of doing some task or performing something. Your technique for opening drinks might be to twist the top off with your teeth. If so, your dentist better have a good tooth-repair technique.
The noun technique can also refer to someone's skillfulness with the fundamentals of a particular task. A violinist could have excellent technique, but lack passion, for example. Writers usually have very individual writing techniques: One might need to write late at night and another early in the morning; some have to write by hand on paper, while others always use the computer.