Invisible Join (Seamless Join)
End a round without a visible “step”. Looks like a continuous row of stitches.
After last stitch, cut yarn and pull tail all the way out.
Thread tail on a needle. Insert needle under both loops of the first stitch of the round (not the slip stitch).
Insert needle down through the center of the last stitch made; pull gently to form a fake “V”. Weave in on the wrong side.
Further reading: Crochet 365 Knit Too: Invisible Seamless Join · Sweet Bee Crochet: Invisible Seam.