A person in a state of a detainee, first of all, needs to remember about self-control and maintaining self-control. You need to be calm, in any case, whether you are guilty of something or not. If you are innocent, then behave calmly, without yelling and insulting, competently and clearly express your position. It is best to inform your relatives / friends about your detention so that if something happens they know where to look for you.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.