The Albright Knot is a versatile knot that has a wide range of uses. It is only moderately easy to tie but it is suitable for joining different types of fishing line, e.g., Monofilament to Braided, or Braided to Wire.
It is also useful when joining monofilaments with markedly different diameters. It is commonly used to join the fly line to the backing line but can be used whenever you wish to join two fishing lines together.
The Nail Knot was originally named because a nail was inserted as a guide when threading the line. Today, it is easier to use a small straw if you can.
The Nail Knot is an important fishing knot used to join two lines of different diameters and allows for line diameters to diminish down to the fly, i.e., it is useful for attaching your backing to the fly line, and your fly line to the leader, or tippet.
The Surgeon's Knot, or Surgeon's Join, is easy to tie and is useful to join two lines of moderately unequal size, e.g., a tippet to a leader. It is actually tied as a Double Overhand Knot - which probably explains why it is sometimes known as the Double Surgeon's Knot - reduntant because "Surgeon's" implies the use of the two turns.
The Surgeon's Knot allows you, with the same leader, to select the size of tippet to suit the size of the fly. It is usually used to join two pieces of monofilament.
The Blood Knot is a favorite knot for fly fisherman. It is primarily used to join two lines of similar size, e.g., when joining sections of leader or tippet, and is one of the best knots for this purpose. The strength of the knot depends on making at least five, and up to seven, turns on each side of the center
The Dropper Loop creates a loop which stands out at right angles to the middle of a length of line It can be used in your leader or tippet to provide an extra attachment point for an additional fly. If desired the loop can be made long enough to set a hook directly on it. However, to minimize the risk of fouling and twisting this Dropper loop should not be too long. The Dropper knot is also used on multi-hook fishing lines.
The Palomar Knot is a simple knot for attaching a line to a hook, or a fly to a leader or tippet. It is regarded as one of the strongest and most reliable fishing knots.
The Trilene Knot is a strong and reliable knot to join monofilament line to hooks, swivels and lures. It resists slippage and failures and is an excellent and stronger alternative to the Clinch Knot.
The Snell Knot allows the leader, or tippet, to be directly tied to a baited hook. It was originally invented for use with eyeless hooks but it is still widely used today. It aligns the fishing line or leader with the shank of the hook.