Verbs have forms called tenses that tell you when the action happens. The simple present tense expresses an action in the present taking place one, never or several times. It is also used for action that takes place one after another actions that are set by a timeable or schedule. The simple present also expresses facts in the present.
To make the present simple positive we use the personal pronoun (I, you, we, they) followed by the verb root.
I play tennis every Saturday.
We learn English every day.
To make the negative, we put do and not before the main verb. the short form of this is don't.
I do not (don't) play football.
We do not (don't) learn German.
To make a question, we put the helping verb Do at the beginning of the sentence. in short answers we do not repeat the main verb.
Do you play tennis every Sunday? No, I don't.
Do they learn English every day? Yes, they do.