1: Firstly, we use the Present Simple when something is generally true. For example,
The sun rises in the east.
People need food.
It snows in winter.
The sky isn’t green.
Water boils at 100°C.
Plants die without water.
Two and two make four.
2: Secondly, we need to use this tense for a situation that we think is more or less permanent (see the present continuous for a temporary situation - one which we think won't last long).
Where do you live?
She works in a bank.
They love coffee.
She has three children.
I am married.
I don't like mushrooms.
3: The next use is for habits or things that we do regularly. We often use adverbs of frequency in this case (also see the present continuous for new, temporary or annoying habits.
Do you smoke?
I play tennis every Tuesday.
We often go to the cinema.
She gets up at seven o'clock every day.
At the weekend, we usually go to the market.
How often do you study English?
I don't travel very often.
4: Four, we use the Simple Present to talk about what happens in books, plays, or films:
The hero dies at the end of the film.
A young woman travels through Europe, where she meets different people, and finally falls in love.
In this book, an army invades Britain.
The main character is very pretty and works in a bookshop.
5: We use it in the first and the zero conditional.
6: Strangely, we can use this tense to talk about the future. When you are discussing a timetable or a fixed plan, you can use this tense. Usually, the timetable is fixed by an organisation, not by us.
School begins at nine tomorrow.
Our train leaves at eleven.
What time does the film start?
The plane doesn't arrive at seven, it arrives at seven thirty.
When does the class finish?
7: We also use it to talk about the future after words like ‘ when’, ‘ until’, ‘ after’, ‘ before’, ‘as soon as’ in a future sentence.
I will call you when I have time. (Not ‘will have’)
I won't go out until it stops raining.
She'll come as soon as her babysitter arrives.
I'm going to make dinner after I watch the news.
I'll give you the book before you go.
