Depending on your suspension set choice you can hang your hammock from:
Two trees
Walls*
Posts
Beams
Two points on the ceiling*
A hammock stand
*Mounting from walls or the ceiling requires solid masonry or drywall with a wooden substructure (studs).
You also have the option of combining different mounting surfaces, for example hanging your hammock between a tree and a post. Regardless of where you choose to hang your hammock, you should always check the load-bearing capacity. If you are unsure, please consult a qualified professional.