Today, I learned about the bounding box and its many functions that resize the selected image.
To begin, grab your Selection Tool and click on the content in the document. Not only will that particular content be selected but a Bounding Box appears around it. This box has 8 handles, which give you the ability to resize the artwork.
If you want to increase or decrease height, you can click and drag up or down either top or bottom handle. If you want to increase or decrease width, you can click and drag right or left on the side handles. If you wanna change both, click and drag the corner handles. Additionally, if you place your cursor right outside a corner handle, a 2-way arrow appears, indicating rotation.