Crochet Cast On
I like the crochet cast on because it’s easy to chain the number of stitches I need. However, it’s not a very stretchy cast on, so consider your project requirements carefully. It is possible to make the cast on a bit stretchier by using a slightly larger hook than you will be using for the project, but you may want to experiment with some waste yarn before diving in.
(Question: Does this have a Knitterly or other official name? I don’t want to muddy the waters by calling it by different name if it already has an established name. KWIM? Thanks!)
I am going to assume that you are familiar with the basics of crochet. If you need to learn how to crochet, there are lots of wonderful websites such as Raverly, Nexstitch Videos, Lion Brand, and more. Check ‘em out! 
Instructions:
1. Make a slipknot and crochet the number of chains as cast on stitches per your pattern.
Slipknot
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Chain the number of stitches needed
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2. Flip your starting chain over so that you can see the back “bump” of each chain. Insert your hook under bump of the SECOND chain from the hook.
Inserting the hook
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3. Work the knit stitch, or stitch requirement per your pattern.
Yarn over
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Pull through...knit stitch made
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4. Continue working into the back bumps of each chain until you reach the end.
Work to the end of the of the starting chain
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Cast on complete
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5. Slide your live stitches on to the holding cord attached to the end of your hook. Turn, and begin working your stitches (per your pattern) into the live stitches on the cord.
Knitting across the row
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6. Keep going, you’ve got it now!
Ta-da!
Comments on: "Crochet Cast On" (2)
[...] Tail or Crochet Cast [...]
I find this technique fascinating. The official term for the cast on you’re using is not “crocheted cast on”, which involves crocheting stitches onto a knitting needle for knitting. Watching the technique, “tunisian cast on” would be the closest term as this is how tunisian patterns are started.