Knooking is a technique that enjoys a strong following among crocheters who want to create knitted fabrics using a modified crochet hook.
Knooking is a cross between knitting and crochet: You use a knooking needle, which is essentially a crochet hook with a cord attached. There are different versions of knooking needles on the market. In the basic version you feed a piece of yarn or string through a hole at the end of the hook (as in the video below).
An alternative is the addi-click knooking version, where a cord is attached to the crochet hook.
It is worthwhile reading "Knook Your Way to Knitting" on the Stitch and Unwind website. The author teaches classes at a craft store and found knooking much easier to teach children than knitting. Some of her adult students who were able to crochet but found knitting challenging told her that "after knooking for a month or so they were finally able knit something with needles."
However, knooking is also a craft in its own right and can be used as an alternative to knitting. There are a few books out with patterns and instructions, such as Veronica Hug's "Knooking : 19 Projects to Knit with a Crochet Hook".
Veronica Hug is a well known German pattern designer who now also has her own yarn label "Wolly Hugs".
She has written over 50 books for crochet, knitting and Tunisian crochet (in German) and is very much a household name in German craft circles. Her list of publications includes five books on knooking.
"Knooking : 19 Projects to Knit with a Crochet Hook" is her first book on this subject that was translated into English. I hope some of her other books will follow soon, particularly her book on how to knook socks!
"Knooking : 19 Projects to Knit with a Crochet Hook" contains 19 easy patterns to get you started. They include hats and scarves, bags and mobile phone covers, and even water bottle holders and sofa pillows, so you are bound to find something you would like to make in this book.
If you want to be inspired and find pattern ideas without any additional outlays for knooking books, you may want to have a look at the blog "I'd rather be knooking". While this is an older style blog that is no longer actively maintained, it has quite a few free patterns, so it's a great starting point.
Once you have mastered the technique you can even work in the round and yes, you can knook socks!