The Portable MFA in Creative Writing, written by instructors from the New York Writer’s Workshop, is currently available for FREE in Kindle format at amazon.com. Check the link.
The book is 280 pages long and contains chapters on writing fiction, poetry, plays, memoir and magazine articles. I haven’t read the book and so can’t personally recommend it, but the reviews at amazon seem pretty good and the book is, after all, free.
If you haven’t tried Kindle books yet, note that you don’t have to have a Kindle device to read them–you can read Kindle books on your laptop, your IPad, whatever.