Thank you @JamieWright for explaining building tips. New members to opensim may not know the basics of Opensim yet and your tips are really helpful.

At my Sandbox three.hills.grid.outworldz.net:8002:Sandbox

I have learning Tutorial that Linda Kellie created that are very well done and easy to follow.

Whether you're new to OpenSim or just want a place to experiment, you're invited to rez, build, and learn in a relaxed and supportive space.

===> Explore our "How to Build in OpenSim" Tutorial Wall
Step-by-step visual guides walk you through the basics—from building your first prim to linking objects and applying textures.

===> Free to use, no pressure—just creativity.
Bring your ideas, rez your builds, and grow your skills at your own pace.