What are the tools in crochet?

For basic crochet the tools you will need are yarn or crochet thread, and a crochet hook of the appropriate size (it should say on the yarn which size hook to use). These are all the tools that you NEED, but a yarn needle would also be useful, and there are many other peripherals that you could make use of, such as a stitch counter, stitch holders, instruction books, flower maker, etc.