The folks over at Canva have put together a fun, interactive Color Wheel tool that might just be the easiest, most enjoyable way way to play around with and learn about color theory.
Understanding the exposure triangle of shutter speed, aperture, and ISO is one of the first steps in learning photography. To help people wrap their heads around the concept, photographer Tony Catalano has created the Interactive Exposure Tool, an online tool for experimenting with how changing camera settings affects the resulting photo of a scene.