Attach yarn [use new yarn here]

Here we explain how to "attach the thread" to crochet using video and still images.
The cover of the video shows the knitting symbol (stitch symbol) for "attaching the yarn."
The video explains two ways to attach the yarn: attaching the yarn at the change of rows of all-over stitches, and attaching the yarn in the middle of the knitted piece.
If you attach yarn at the change of row in back and forth knitting, change to new yarn and pull it out when you complete the last stitch of that row.

Video explanation

Photo Tutorial

Attach the yarn at the change of the row of the loop stitch.

Attaching yarn in the middle of knitting