In this video I talk about the selection tool and a few things you may not know regarding it. For example making a selection box from left to right is a “selection window”. This means that anything 100% completely inside the “window” will be selected. Making a selection box from right to left is a “selection crossing”. Anything that crosses the area or perimeter of the rectangle will be selected. You can also select and deselect multiple items by using the shift key and clicking with your mouse. Using the ctrl key and clicking with your mouse will only add to your selection and not delete from your selection.
I always recommend using keyboard shortcuts for everything you do in SketchUp. It will greatly increase your efficiency. The keyboard shortcut for the selection tool is the “space bar”.