The Two Half Hitches is a great knot to tie rope to any object. It has the ability to pull tight to any object that it is tied to. The best quality of this knot is that it can be used on any sized rope. This knot is in my top 3 for important knots.
In order to tie this knot you first loop the rope around the object. Then you take the loose end and wrap it around the taunt rope and under it. Then repeat. Wrap the loose rope around the taunt rope and under. Pull both loops tight and you are done.