So, today's editing tip is on a couple of issues that sometimes cause confusion. Hopefully I can spell out the differences nice and simply for you.
Their = belonging to them e.g. They opened their books.
There = a place/destination e.g. Put the books over there.
They're = they are e.g. They're eager to start reading the book
Awhile vs. A while
Awhile is an adverb; whereas a while is a noun. Here are some examples:
It has been a while since he last read a book.
Go read awhile
NB: If you have the word 'for' in there, it will be a while e.g Go read for a while.