You asked: How do you slip stitch by hand?

What does it mean to slip stitch in sewing?

1 : a concealed stitch for sewing folded edges (such as hems) made by alternately running the needle inside the fold and picking up a thread or two from the body of the article. 2 : an unworked stitch especially : a knitting stitch that is shifted from one needle to another without knitting it.

THIS IS FUN:  Your question: Can internal stitches not dissolve?