The Siberian hitch knot is used for securing a ridgeline to a tree. Simple to tie, very strong, but also a quick-release knot. If you are hanging a tarp above a hammock for hammock camping, or over your picnic table, this knot will hold the center of your tarp up for you.
For a complete guide to the basics of hammock camping, check out our Hammock Camping 101 article. And for more great how-to videos, go check out Black Owl on Youtube.