Question

in which sentences we can use has?

Answer 1

Has is used with the third person singular. For example:
'She has a great personality.'
'He has a new haircut.'
'The washing machine has a leak in it'.
'It has a hole near the door.'

Answer 2

The word has is used to indicate possession over something of a third person

For example-
He has a pen
Here has indicates possession of pen of the third person i.e. he

Hope u got it :-)