Are there any tutorials on "bounding boxes" and also those lines on the view window? Likely have to do with X Y Z somehow.
I told you I was a new learner [and likely a slow one at that] LOL. ???
The coloured lines in the view window (when you select a terrain/object/population) indicate the direction of the x,y,z axes (red,green,blue respectively)
As for bounding boxes, they indicate the size of an object and the location it will occupy in space. It's the smallest box-shaped space that would completely enclose the object.