The difference with -도 What’s the difference between adding 도 to a noun or pronoun and adding 도 (aka -기도 하다) to verbs?

Does it imply some other meaning?

Ex1) 저는 영어도 가르쳐요.
Ex2) 저는 영어를 가르치기도 해요.

It means I teach English as well/also for both right so then what is the difference?