Plain, Double, or French Crochet.
Make a chain. After commencing the row, put the needle in a stitch of the chain, draw the wool through; there will be 2 loops on the needle. Take the wool on the needle again, and draw it through the 2 loops. At the end, cut the wool off, draw it through, and begin at the other end.
Treble Crochet.
Make a chain. After commencing the row, put the wool round the needle, put the needle in a stitch of the chain, draw the wool through; there will be 3 loops on the needle. Take the wool on the needle again, draw it through 2 of the loops; take up the wool again, and draw it through the 2. This is 1 stitch.
Crochet.
In two colors.
This is always worked in plain crochet. Lay the color not wanted along, and work over it. In changing the color, draw it through before finishing the stitch, when there are 2 loops on the needle.