What does this rebus means ?

PROG WORKRESS

John was writing his first book. After saving the document, he locked his laptop with a password and mentioned some phrases for the hint box.

A friend of his tried opening his laptop but found out that it was password protected. Following is the hint that appeared.
1 mobile 3 books 2 roars 1 night 4 balls 2 lighters 1 ghost 1 hat 3 watches.

Can you help him in cracking the password?

Why blonde cannot dial 911?

There is a unique number which when multiplied by any number from 1 to 6, we will get the new number that contains the same digits only.

Can you find that number?

What's a single-digit number with no value?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

Spot 5 differences in two Christmas tree below:

Why did the Girl throw the butter out of the window?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

While handling a project, the landscaper is asked by the owner of the mansion that he wants four trees in front of his mansion that are exactly equidistant from each other.

How will he do it?