Understanding how different yarn weights affect your project's gauge, tension, and overall aesthetic is key to achieving great results.
Can I Use a Different Weight Yarn for My Project? - Ambassador Crochet
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Pattern Basics: Part 3 – Yarn Substitution – Crochet World Magazine
Yarn Weight Thickness ・ClearlyHelena
Mixing yarn weights? - Crochet Help - Crochetville
How to crochet with variegated and self striping yarn - Dora Does