|Angelfish knitted using a square chart|
|Angelfish in cross stitch using the same square chart.|
For normal crochet, each square can be either a slip stitch, or a single crochet - again the result will be different depending on which one you use.
I have embedded some videos below that will teach you the basics of filet crochet, intarsia, stranded and double knitting.
Double Knitting Basics
Flat Tapestry Crochet
DOUBLE KNITTING VIDEO