There are many convenient ways to get an image into the Wolfram System, including drag and drop. You can also import images by evaluating commands in a notebook. Once you have an image to work with, you can use any number of the Wolfram Language's image processing functions to analyze and customize it.
Selected examples from the video:
The simplest way to get an image into the Wolfram System is to use drag and drop. When dropping an image into a notebook, your mouse pointer will change to indicate that content is being copied:
When working with other applications, such as image editors or web browsers, you can copy an image and then paste it into the Wolfram System with Edit▶Paste:
You can also do the same thing by right-clicking and then selecting Paste from the contextual menu that appears.
From within the Wolfram System, you can choose Insert▶Picture▶ From File and then choose a picture to insert, using your operating system's file browser:
If you know the file path of the image on your computer, you can use Import to get the image into the Wolfram System:
If you do not know the file path, you can use Insert▶File Path to insert it with your operating system's file browser: