The index page is the default page that a browser looks for in the root directory (or root folder).
The pargaraph (p) and heading (h1-6) elements are block level elements. The image element is inline. They behave differently. Blocks want to have their own line and stretch across their container. Inline wants to sit right next to whatever precedes it on the page. Since this paragraph is a block level and has expanded to meet the width of the page (its container), the image is sitting on the next row down, left justified.
a small paragaraph under the image.