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The next one I like is the Truckers Hitch. You use it to say secure a kayak/canoe to the roof of your truck. It adds tension and lets you cinch up on your load by giving it like a 5:1 advantage.
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One of my favorite knots.
Each time you loop it around, you get more mechanical advantage;
the force generated can be tremendous. Be careful, you can actually
break things (like canoes) with this knot.
Make a habit of examining your ropes.
If you use a rope where it may be abraded at one particular spot,
you can protect the rope with tape. In place of a rope-loop which
gets abraded, you can sometimes use a metal ring or carabiner.
Ropes made of modern materials are much slicker than old types of ropes.
Some knots may fail, so read discussions of this.