To put an image on your website first take care of these two steps:

1. You have an html file, eg: index.html

2. Your image is in the same directory, eg: photo.jpg

Now insert this code into your html file:

<img src="photo.jpg" />

Alternatively, you can specify an image height/width, but that's not necessary because it can distort the image and if you ever replace photo.jpg with a different sized image it will appear wrong. The browser automatically knows how to size your photo.