My dad is a teacher and teaches others so they acquire knowledge
That's awesome. What subject does he teach?
Teacher
A teacher (also called a school teacher or, in some contexts, an educator) is a person who helps students to acquire knowledge, competence or virtue.
"Informally" the role of teacher may be taken on by anyone (e.g. when showing a colleague how to perform a specific task). 
In some countries, teaching young people of school age may be carried out in an informal setting, such as within the family (homeschooling), rather than in a formal setting such as a school
taught. I wanted to play Elvis. I liked all the old 50s music. My dad had a bunch of old 50s records because that's when he was a teenager. Those were what I listened to, because when you're six you don't have the money to go buy stuff, so I just listened to his records. Nobody was going to teach me how to play the guitar like that, out in the country where I lived. I just gave it up until I was 13 or 14. I