Invisible Fasten off

    For pieces that’ll be sewed onto another, or for a piece where the edge will be seen,  you can use a technique called the “invisible fasten off.” This technique makes the edge look smooth.
    once you’ve finished your last stitch, cut the yarn to make a tail. Remember to leave a tail long enough so that you can use it to sew this open piece onto another piece.

 HOW TO FASTEN OFF IN CROCHET (STEP-BY-STEP WITH PHOTOS)

Q&A

WHAT IS AN INVISIBLE FASTEN-OFF?
 An "invisible fasten-off" is a technique used to finish off a round crochet piece neatly and invisibly, so that the rim of your piece looks smoother. It's mostly used in amigurumi and other crocheted items where you want to have a seamless finish.
 HOW MUCH YARN SHOULD YOU LEAVE?
 It depends:- If you’re planning to hide the yarn tail, which is called weaving in the yarn tail,
 leave enough so you can comfortably thread a needle and weave in the tail.- If you’re going to join this piece to another, leave enough yarn to do that and weave in there maining tail. The way you weave in the yarn tail depends on if you're finishing a flat piece, or a round closed piece