I used two guides to remind myself about technique:
Tapestry Weaving by Kirsten Glasbrook which is an excellent and user-friendly guide for beginner weavers.
The Tapestry Handbook by Carol K Russell (out-of-print). A precise and highly detailed resource when you are ready to go deeper.
Book Butler is a good price comparison site when searching for out-of-print (and in-print) books. It's well worth checking Ebay too.