Save style.css in the same folder as the index.html page.
This text is italic.
This text is bold.
My name is XYZ and I'm ?? years old.
Inserting images into your HTML file uses very similar code. For instance, I've put an image called "slime.png" inside my "images" folder, which is inside my main website folder. So, inserting images is a lot like making a link. Instead of putting the URL of a website inside those quotes, you type in the path to your image. (You can link to images from other websites, but that's called hotlinking, and it's not a good thing to do.)