It basically denote habit, custom, practice, repeated actions, general truth, permanent activity, etc. It is also used for statements mentioning ‘historical present’ and ‘future arrangement’. (Eg: She leaves his job next week)
The correct structure of the sentence of Present Indefinite will be:
SUB + V1/ V5+ ………
SUB + IS/ AM/ ARE+ COMPLEMENT

Example: She work with an esteemed organization.