People have strange ideas regarding tasawwuf. Some feel it is only about zikr while others feel it is about seeing some good dreams or having some good experience etc. However, the essence of tasawwuf is taqwa and ihsaan.
Taqwa means to desist from all impermissible and doubtful things, and ihsaan means to have the consciousness of Allah Ta‘ala at all times. Not only during salaah, rather even when one is in his business or with his family. Like a person who is working in a company and he knows that his employers are watching every move of his, and if his performance is good he will qualify for a 30% salary increase. When one has this level of consciousness of Allah Ta‘ala, committing sins becomes impossible.