A great graphic reference for basic advanced crochet stitches. A quick glance can help during new or more difficult projects. Chain Slip Stitch Double Crochet Treble Crochet Half Treble Double Treble Treble Cluster Treble P
Biggest problem most people have -- How to get a straight edge on your work? Great tutorial that "demystifies double crochet" so you know how to crochet the end of the row, turn, and start the next row. It gives you straight edges this way.