This is a great starting point for many ties. The ropes around the body don't tighten, even with a lot of tension from the rope.
Cross Friction / Munter Hitch
Stabilising ropes that cross in a perpendicular angle to create a more solid structure. It is a great way to start improvising with the ropes.
Extending Ropes
If you run out of rope, this tutorial shows how to connect your old rope to your new rope. There are two variations of which one is suitable for suspension.