Get a book and read it.

Meaning: This means to go and find a book and then look at and understand the words that are written in it. It's like when you go to the library and pick out a book to read.

Choice of Words: Get means to go and take something. Book is a collection of written or printed pages that are bound together. Read means to look at and understand words that are written down. Together, "Get a book and read it" means to go and take a book and look at and understand the words written in it.