I knot and bury my threads. I usually do it as I go along. If I wait and do the whole quilt the threads get tangled on the back so I do small sections of the quilt in stitching and then pull the top thread to the back, knot and bury the threads. I have a favorite big eyed needle that I use. This method also breaks up my sitting at the machine for too long and eases shoulder, arm and hand strain that I can get when I machine quilt. I also like the way it looks when I'm finished.