Here are a few tutorials of how I work various techniques. I hope they help you on your stranded colorwork journey. If you do not see what you are looking for, please let me know. I'll be happy to try to create a tutorial to help you.
Various cast-on methods.
Adding new color using tapestry needle.
Weaving long floats using right hand
Weaving in floats from one needle to another.
Weaving in new color before end of round.
Holding yarns. Two handed method.
Adding new color using knot.
Weaving long floats using left hand.
Adding new color at beginning of round by weaving 1st stitch.
Weaving out old color at beginning of round.