Just as there's a yarn for every occasion, there's a KNOT for every occasion. The Fisherman's Knot is quite possibly the best one I know for keeping two ends of yarn together - and it does so without creating a huge, wonky protrusion in your fabric.
by Tan Jing Wei
by Hectanooga1 - Crochet, Knitting,
by Funtastic Ideas
by EzzyCraftsDIY
by As You Wish Pottery Painting
by Sonali's Creations
by Renu's Craft World