My dad is a teacher and teaches others so they acquire knowledge
That's awesome. What subject does he teach?
third grade but anyone can be an informal teacher
Did he have to go through any special training to become a teacher?
or college. 
Some other professions may involve a significant amount of teaching (e.g. youth worker, pastor).
In most countries, "formal" teaching of students is usually carried out by paid professional teachers. This article focuses on those who are "employed", as their main role, to teach others in a "formal" education context, such as at a school or other place of "initial" formal education or training.
Duties and functions.
A teacher's role may vary among cultures
2. These examinations form a cohesive bridge between the work covered in the Grades and the work of the professional examinations.
Examinations Professional qualifications.
Dancers who have achieved a high level examination pass in an ISTD dance subject can progress into teacher training with the organisation. The teacher training is provided through approved dance centres and consists of both theory and practical examinations designed to demonstrate the candidates ability and knowledge to teach dance. People who successfully complete the training become registered teachers of the ISTD and may enter students for examinations in the