I do it a few different ways. When I crochet something to be attached to an earring or key ring, I just do a couple of single crochets through the piece and the keyring. Or you could chain stitch until it's as long as you want, put it through the ring, and attach it back to the item.
This isn't my tip, but it really works. I saw it on some morning news show where they were interviewing the winner of the fastest crocheter contest somewhere. She used cooking spray to grease her crochet hook. I spray a little on a paper towel and then polish my crochet hook with it. It works on plastic and aluminum hooks.
I love the Encyclopedia of Crochet by Donna Kooler. It's great for inspiration. I don't usually by pattern books because I like free form, but this book was definitely worth the money. It doesn't have too many patterns but more instruction on the different types of crochet and lots and lots of different stitches and techniques.
Hold the two pieces together with wrong sides facing each other. Slide your hook through the first crochet stitch on the first piece, slide it through the first stitch on the second piece, yarn over, pull the yarn through, and complete a single crochet stitch. Repeat.
This makes a slightly raised line of crochet stitches.
Just a few minutes ago I stepped on a long sewing needle and an inch of it was in the bottom of my foot. The worst part was pulling it out. At least I got an update on my tetanus shot a few months ago (cut my arm on a piece of glass and had to get stitches). It really hurts! Hope it stops hurting soon. At least it isn't bleeding anymore.
My mom had the same thing happen, but the needle went through a bone in her foot and she had to have surgery to get it out. I'm gonna go count my blessings now...