How to use a different yarn in a crochet pattern - Shelley Husband Crochet
Understanding Crochet Hook Sizes & Yarn Weights
resurrection fern: Knit a Scarfette with Vintage Buttons: a Tutorial
Neffie Thimble: "If I can knit with this Noro ridiculousness, my own ugly chunky homespun art yarn of varying thickness and clashy colours will also be perfectly usable. 🧶" — Bluesky
Why do all these weight 4 yarn have different thickness? (More in comments) : r/crochet
Choosing Yarn, Introduction and Weight
Tutorial Tuesday ~ Combining two yarn types to make a different yarn