The present simple is the tense for things that happen regularly or are always true. The verb stays in its base form, with an -s added in the regular case when the subject is he, she, or it.
I walk to school every day. With he, she, or it, the verb adds -s: She walks to school every day.
My uncle lives in a small town near the coast. The verb lives carries the -s because he is one person, a he. It states where he is settled, not what he is doing at this exact moment.
Buses in many cities leave the station every ten minutes. Here the present simple describes a schedule, something that happens again and again. There is no -s on the verb because buses is a plural third person subject, and the -s ending appears only when the subject is one he, she, or it.
The present simple is a verb tense used to talk about habits, general truths, and fixed situations, such as She walks to school every day. In its regular form it uses the base verb, with an -s added when the subject is he, she, or it, so you say He walks to school every day.