This is how I attach my Granny Squares when I am making a afghan. It is very easy to do and is only a single crochet stitch. I also make 2 rows of single crochet for the border of a granny square afghan. Enjoy and thanks for watching!
by Волшебные рисунки
by Knotty Threadz
by Guidecentral English
by third eye
by Arts For Kids
by MACRAME MAGIC KNOTS