Fiber Flux Blog provides step-by-step tutorials and YouTube videos for knitting and crochet stitches. There are also free patterns along with video instruction for the patterns.
This website gives you a list of common abbreviations you'll come across in a written pattern. It's laid out in a compact way that you could easily print and reference.
The website gives an extensive look into reading a patter in chart form. It goes into all the elements of a chart, including what the symbols mean and how to go about reading it. The website also goes into how to read a chart for lace patterns, colorwork, and cables.
This website shows a chart with the different yarn sizes, also known as weights. There are various names for each size which are listed in the chart. The website also gives the needle or crochet hook size that will work best with each weight of yarn.
This website mentions the various sizes of yarn and gives a description of what they might be used for. The website also talks about the various types of yarn and gives a description.
This website gives information on size, type, and material of knitting needles. There are written descriptions of the various needle types as well as pictures.
Founded in 2007, Ravelry is a free community site, organizational tool, and a yarn/pattern database for knitters and crocheters. In order to use the site, you must create your own (free) account.
The TKGA is a global non-profit organization dedicated to helping knitters all over the world. The site contains a guild locator so you can find a local group.