Nancy Zieman's Sewing A to Z
I checked this book out from the library just to flip through it and see what I could learn. I'd recommend it to anyone who wants to begin sewing or quilting.
There are about as many techniques and tips as there are seamstresses, and you don't have to do everything, or anything, for that matter, by the book. But I am not always bold and adventurous, especially when it comes to a pricey piece of fabric, so having a guide to consult is helpful.
Another resource I've used is Stitch magazine. It's a little more random, but each issue has several techniques in it, as well as a glossary of the terms used in the instructions throughout the magazine. I find that once I've read it, I tend to dog ear those pages and refer back to them if I'm trying to pick up something new. Stitch Magazine also has a blog called Sew Daily, sewing made modern. Check out their tutorials and templates, or just browse and inspire yourself with all the possibilities!