Ummmm, you sure you meant to say a nail knot? AFAIK, a nail knot is used to tie two lined together, just as a blood knot is... for example two lines of a different weight, or a fly line and a leader.also learn how to tie a nail knot to attach line to hook as that will save lots of lost fish.
Agree with guided smallmouth river trip... 100+ fish!!!
Yeah, granny knots won't work.
Perhaps the most used knot is the Improved Clinch Knot... also known as the Fisherman's Knot (I think) for monofilament. When using high tech line such as Spiderwire, a Palomar Knot is needed to keep the line from slipping thru the eye of the hook or lure. These knots are a must, and easy to learn via diagrams or YouTube.
Learning how to tie a loop into a bottom weighted line is useful for using pre-snelled bait hooks that some with loops on the end of a short leader. A double overhand knot works fine for this.