Another vital knot to learn is the Water Knot. Typically used to join two ends of webbing together, it is a vital knot to learn for making webbing loops for anchors, makeshift harnesses and rescue loops. The Water Knot is strong, but when tied correctly is also easy to untie. You will find yourself using this one quite often if you deal with webbing.
Be sure that you leave enough of a “tail” on either side of the knot to prevent an end from slipping through the knot as weight is set on it. I typically tie the tails down to the loop with a simple overhand knot for added insurance.
An additional tip for knot tying. I recommend that you practice tying your knots while gloved every once and a while, especially if you plan on mountaineering or ice climbing.