There's a few knots that you really should master on the stream side. One if your leader or loop connector comes apart from the fly line, it is called a nailless nail knot. It is something that is quick and easy to tie. You take the butt section up over the line. There is four turns and you go back through the loop. There are many animation videos on web to follow how to tie these. The next knot that is needed to know is your perfection loops. That's so you can slip your leaders on and off with. Another knot which is good to know is when you use the leader and then you need to fasten a tippet, changing a tippet size from 3x to 5x to 6x or however is I prefer on the stream side to use a double surgeon's knot which is again a very easy knot to use. Always before you tighten your knots down, wet them to lubricate them with the, because what happens is when you tighten the knots down they can burn without any lubrication. Lubrication is done easily just through the mouth and done or if it's in the water as well. Another important knot to know and master is the improved clinch where it fastens the fly to your tippet through, take your tippet through the eye of the fly, I like going through the bottom through six turns, back through the large loop and then the loop that's created at the very front of the tippet you go back through that again, snug it a little bit, wet it, tighten it, done. This knot here I like using for trout fishing, on tippet sizes from 4x all the way up to 6 or 7x. Below that knot, below that tippet size I like using what's called a snap knot which is done with a pair of forceps. Those are the knots that you really should know on the water so you can continue to fish all day no matter where you have line breakage.