While sat with poorly babe this evening I've been using the only crochet book (hooked on crochet by Candi Jensen) I have to actually learn new stitches. This is an American book so not sure what the English names would be. The above is triple crochet (tc) - didn't really like this one.
This one is double crochet (dc)- I like this one as it looks very neat.
This one is single crochet (sc), again very neat.
And lastly, we have half double crochet (hdc). This is what I have done on the granny squares without actually realising it. Explains why they are small ;-). Anyway, off to do some more as I'm finding it very addictive and theraputic.