GRAMMAR: Present Simple or Continuous?

PRESENT SIMPLE

USE 1: Repeated actions / Routines

Expressions of time: adverbs of frequency (always, often, usually, sometimes, rarely/seldom, never); every week; every Sunday...

Examples:I play tennis every weekend.
The train leaves every morning at 8 AM.
She always forgets her book.


USE 2: Facts / Generalizations






Examples:
Cats like milk.
California is in America.
Windows are made of glass.

PRESENT CONTINUOUS

USE 1: Actions happening now / at the moment of speaking

Examples:You are learning English now.
At the moment they are reading their books.
Look! He is doing his homework.



USE 2: Longer actions in progress now





Expressions of time: today; this week; this month; this year...

Examples:
I am studying to become a doctor.
This week I am reading the book Tom Sawyer.

Non-Continuous Verbs

These verbs are usually things you cannot see somebody doing. 
They include:
Abstract Verbs: to be, to want, to cost, to seem, to need, to care, to contain, to owe, to exist...
Possession Verbs: to possess, to own, to belong...
Emotion Verbs: to like, to love, to hate, to dislike, to fear, to envy, to mind...

Examples:
He is needing help now. Not Correct
He needs help now. Correct

He is wanting a drink now. Not Correct
He wants a drink now. Correct