Digitizing and editing existing material
What you find on paper only, can be digitized by scanning.
Windows provides the “Snipping Tool” to cut out portions of the screen, and to save them as images. You can also make screenshots using the same tool.
If you find (digital) material that you would like to adjust a little bit (shorten, add additional notes, etc.) there are also tools for that. Often these are the tools which are used to create learning material.