Present Simple versus Present Continuous

Present Simple:

He walks to work and He is walking to work do not mean the same thing. He walks means that he always or often walks, but we do not know if he is walking now.
 
This is Mr Andersson. Mr Andersson is not driving a bus (he is asleep), but he drives a bus (he is a bus driver).
 

 

Compare to Present Continuous:

Mr Jones usually walks to work, but today he is driving. Mrs Andersson usually plays the guitar, but today she is playing the piano.
 
There are some verbs that you do not usually use in the continuous, for example hear, see, hate, like, belive, mean, understand, know, remember, forget, want, seem, own, belong.
 

For example:
You cannot say I'm liking Paris. You must say I like Paris.

You cannot say What are you meaning? You must say What do you mean?