I'm attempting to develop an orthogonal game with lwjgl 3 and OpenGL in Eclipse, but I can't find an answer for rendering objects in 2D or 3D. Are both applicable? And if so what are the advantages of either one? I would also like to rotate my camera if that changes your answer.
The orthographic camera should almost always only be used in 2d. Instead you should use the perspectivecamera
You can read more about the orthographic camera here: https://github.com/libgdx/libgdx/wiki/Orthographic-camera
Read more about creating 3d games in libgdx here: https://xoppa.github.io/blog/basic-3d-using-libgdx/
On this site it is explained why you should use the perspective camera for 3d instead of the orthographic camera: http://www.gamefromscratch.com/post/2014/12/08/LibGDX-Tutorial-Part-16-Cameras.aspx