All the objects in my scene are suddenly circled with a dark orange stroke. I can't seem to modify, delete or even select some of them...
Just a beginner at Blender, but I couldn't get an answer anywhere I looked.
Blender Stack Exchange is a question and answer site for people who use Blender to create 3D graphics, animations, or games. It only takes a minute to sign up.Sign up to join this community
The reason you can't select other objects is because you are in Edit Mode.
The reason for the orange outlines is likely due to having entered edit mode (↹ Tab) while all objects were selected (A):
While in edit mode, you can edit the mesh of the Active object, but cannot move any other objects. To select a different active object for editing, you'll have to first toggle back to Object Mode (↹ Tab) before clicking an object with RMB.
Also see the blender manual.