Images are like links, but you prefix them with an exclamation mark.
The part between square brackets is the image alt text.
Between the curly brackets you place the location of the image file followed by a space and the image title between quotes.
![This is the alt text]( )
The convention is to always place your images in the same folder as the text where you are including the image. That way, you just need to specify the image name, and not the path to its location.