Seek and you will find…
The above image shows the default bounding box handles.
To change this to the outside border of the stroke, go to the Illustrator menu and choose Preferences > General. There you check Use Preview Bounds and click OK.
Now you have the bounding box handles at the outside of the stroke, which makes it easier for precise resizing. Changing this also affects the width and height info in the option bar and the X and Y coordinates.
Reset Bounding box
Another short tip is, that you can reset the bounding box via Object > Transform > Reset Bounding Box. This can be handy in situations where you end up with a bounding box that is really hard or impossible to work with.
Here is an example…
You've created a triangle shape by first drawing square, rotate it 45° using shift, and then you remove the bottom anchor point with the Pen tool, as shown in the different steps in the 2 images below. In this situation, resetting the bounding box is really welcome.
These are small tips, and maybe you've known them already, but in case you didn't I hope you find them useful.