A neat cast-on edge is the easiest way 👌 

I suggest you learn the easiest way to cast on loops neatly and professionally.
Using the classic method of casting on, cast on an odd number of stitches.
1st row: slip stitch, *knit 1, purl 1, repeat from *.
2nd row: remove the loop, * purl 1, draw the right knitting needle under the work in the other direction, remove the loop and bring it to the working side, put it on the left knitting needle and knit it with the front one, repeat from *, purl 2.
Next, knit with an elastic pattern, a garter pattern or a braid pattern.