Add another yarn ball

If you've used up all your yarn, add a new ball of yarn to keep on crocheting. This is called "joining" yarn. Adding a new ball of yarn in crochet uses the same technique you would use when changing colors, but instead of introducing a new color, introduce a new yarn ball.

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It's best to join a new yarn ball at the beginning of a row or round, rather than in the middle. This makes it easier to hide the yarn tails and creates a neater finish.
Leave at least a 6-inch yarn tail from both the old and new yarn balls. This gives you enough length to weave in the ends securely.
While you can tie a knot, it's not recommended as knots can come undone and create bumps in your work. The color change technique creates a more secure and invisible join.