1. Verbs in the Present Simple: used for repeated actions, thoughts, feelings and states.
They never eat carrots.
How often do you go to the cinema ? (Do is the auxiliary verb for this question)
They don't like potatoes. (Don't is the contracted form for Do not)
2. Verbs in the Present Continuous: used to say somebody is in the middle of an action)
What are you doing now ? (verb to be + verb + ing)