How do you crochet?

Check your local library, or community center to see if they offer classes. Also check your local yarn shop.
See links below for additional help.
(that was an ok answer but I dont think you explained how to crochet, you just explained how to get help): Actually, crocheting is different than what this person wrote. Ill give you the real answer. first you make a slip knot over the hook. then yarn over and pull through the slip knot. if you keep repeating the proccess, you will begin to do the chain stitch. If you really want to learn how to crochet you need to find someone that knows how I learned going to a senior citizen home I now can do so many new things watching someone else do it helps alot. keep your string tense but easy to loop . Go to a used book store they always have books that show step by step dont' give up practice makes perfect.

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There is not one answer to this question as there are many different types of crochet. It also depends on whether you intend to make a straight piece or a round piece. YouTube is a great resource for learning how to begin the process.

Before beginning you will need to get supplies. You will need a crochet hook. You will eventually have a preference as to size and type of hook, but for beginning you might consider getting a mid-size hook, perhaps an I or J. You will also need yarn - a light color, medium weight, is best for learning. If you get a chunky yarn, be sure to get a hook size appropriate for the yarn. Suggested hook should be listed right on the yarn label.

Keep in mind that some yarns contain wool - if you are allergic, check the material on the label.

You will also need a good pair of scissors and a yarn needle. I like the #16, but that is a personal choice. If you are following a pattern, you may need a ruler to check gauge.