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 howtofunda
by S Crafts
by Hamsini crochetworld
by Arty's Corner
by KS handmade Store
by MrUsegoodART
by Noreva Projects