Wortnetzwerk: ist

A belief is an acceptance that a statement is true or that something exists, often without absolute proof. It also refers to a firm conviction or trust in the value or truth of someone or something.

The act of doing an activity or training regularly to improve a skill. It can also refer to the usual way of doing something or a professional business, such as a doctor's office.

An expert is a person who has a very high level of knowledge or skill in a particular subject or activity. This person has usually studied the topic for a long time or has many years of practical experience.