Invisible fasten off (Invisible finish)
Invisible fasten off is a crochet technique to join stitches together and fasten off the yarn usually when crocheting in round.
Step 1: Final round, cut the yarn off leaving a long end, thread end onto needle
Step 2: Insert needle into the back loop only of next stitch (first stitch) pull the yarn through
Step 3: Insert needle into both loops of next stitch (second stitch) pull the yarn through
Step 4: Insert needle into the front loop only of last stitch (previous stitch) pull the yarn down through
Weave in the tail and completed your invisible fasten off!