How to measure your gauge swatch
Why you should never skip the gauge swatch before starting a new knitting project
Swatching and Measuring Gauge in Cable Pattern – Kelbourne Woolens
Knitting swatches to determine needle size and to measure gauge - KNITmuch
Yarn Weight Chart & Guide to Yarn Sizes/Types
Determining Yarn Weights
How Much Yarn Do I Need for a Crochet Project? - Sarah Maker
Make Swatching an Enjoyable Part of Knitting – Carol Feller
What to Crochet with Sock Yarn