What are "Moles"? Well, they are a sample of an element with a mass equal to that element's average atomic mass. Which is expressed in grams.
When the element's average atomic mass is met, then we got one mole of that element. There is a number to one mole since to get one mole of the element, we do atomic mass of an element multiply by the "mole number".
The picture below shows that one "mole" equals to about 6.022 times 10^23(10 to the power of 23) Which is (6.022 times 10) plus 23 "zeros" at the end.
Now that we know what's the number to a mole, lets try doing some work in the "Deep Dive" page