You want the strongest knot promising that you do not lose the fish.
Practice with a hook buried into a piece of cork or with the tip cut-off for practice. Practice until you can tie each knot properly. There is plenty of line for practice.
Wet knots with saliva as you pull them taut to prevent harm to the line. This permits the knot to pull tight preventing your loss of a great catch.
Trim knots close with a nail clipper; Close trimming prevents the knot from catching on weeds and other under water objects. A good knot will not come loose when pulled tightly. Do not burn the tag end heat damages the line and makes the knot less dependable.
Knots have their own expressions which includes the "tag end" (sometimes called the "working end"). This is the end of the line used to tie the knot. The "standing end" is that part of the line extending from your fishing reel.
Keep a foot or more of the "tag end" of line for tying knots so that you can tie them correctly.
Pull up all ends when tightening the knot. Some knots only require the standing end and tag end while other knots may involve three or four ends.
Knots are seldom as strong as the fishing line. Knot strength is often spoken of in percentages, such as the percentage of the strength of the line at which the knot (weaker than the line) will break. For example, a knot testing 90 percent will break at nine pounds of tension in a line testing ten-pounds.
Knots needed for: blade bait, crankbait, floats and bobbers, hooks, jigs, snaps, bait, reels, soft plastic lures, spoons, spinnerbaits, sinkers, and finally top water lures.