Emily Ocker’s Circular Cast-On, made popular by Elizabeth Zimmerman, is the easiest circular center-start cast on.
It uses a crochet hook to create the number of cast-on stitches needed, and the stitches are then slipped onto a long circular needle or double-points.
When you pull the tail tight, the cast-on zips up into a circle. A little hole is still visible – if you don’t like the hole, try the Invisible Circular Cast-On.
The invisible Circular Cast-On is used to start in the center of a project that is knit in the round.
Casting on into a ring of yarn places the stitches on your long circular needle. When you arrange your needle for knitting in the round, you pull the tail tight and the circle zips up and closes completely.
The Garter Tab Cast-On is an ingenious way to invisibly start a triangular shawl.
A provisional cast-on is used to cast on two or three stitches, then the working yarn is used to knit in garter stitch until you have a little strip of fabric – the “garter tab.”
Picking up stitches along the edge of the tab and in the provisional cast-on places the stitches in such a way that you are ready to start the triangular shawl and it is impossible to tell where you started.