When you knit with a ball of yarn, it will eventually run out and you will need to start a new one. Here are two possible solutions to changing knitting yarn. This article discusses the exact stages needed to change knitting yarn. Start at
How to Change Colors in Knitting: 13 Steps
How to Crochet: 15 Steps (with Pictures) - wikiHow
Tunisian Crochet in the Round –
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3 Ways to Change Colors when Crocheting - wikiHow
Twist and weave - a super neat way to join a new color in knitting
How to Change Yarn in Crochet (technique #1) : 8 Steps (with
How to Change Yarn: 10 Steps (with Pictures) - wikiHow
How to Change Colors in Knitting: Seamlessly switch Yarn