The date on this post is wrong. Today is March 34. ;)
Traditionally, when you're crocheting something with more than one row in it (which is anything other than a simple edging, of course), you get from the end of your current row to the beginning of the next row by crocheting a few chain stitches, which count as the first stitch of the next row. On flat pieces, this can make an edge that's a little wobbly looking, and on round pieces, it leaves a visible seam.
YouTube video poster TXCr1cket demonstrates a method for creating a freestanding double crochet stitch to replace those wobbly, seam-ly chains. It makes a nice even edge in flatwork, and a nearly invisible seam in round works. Watch and learn: