This cast on and off is used for projects like infinity scarves, blankets, etc. You can see some samples in this video ( at minute 13) ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-SqSFfAbLxRQ.html
I tried waste yarn, but I want to make a hat, so what do I do before removing the waste yarn, to secure them, because I lost all my stitches by just removing waste yarn😞
Like in this video ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-jGI1PsR-gmc.html, before you remove the waste yarn pick up the live stitches (main color) with different yarn and needle.