Try the "Orvis knot" for flies.....Google it or look on YouTube for instructions. I also use the same knot when tying lures to the line on my baitcaster. Been using it for over 20 years and it is simple and VERY reliable. For LMB or BG fly fishing you only need 2 knots....the Orvis knot and a "surgeon's knot". The surgeon's allows you to tie together 2 pieces of mono either the same size or different diameters. But a nice, level short 4 foot piece of mono looped or tied onto the loop at the end of your fly line is all that is needed....LMB and BG don't care and are way less picky than a trout.
