Concepts
We use the present simple to talk about:
Routines and habits.
States, feelings, thoughts, beliefs and ideas.
General information.
Rules
For "he", "she", and "it", we need to add "+s" to the verb in affirmative, and use the auxiliary "does" or "doesn't" in questions and negative.
For the rest of the pronouns, we don't make changes in the verb, and we use the auxiliaries "do" or "don't" in questions and negative.
You can check all the information in detail and practice with the following presentation.