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This site has hundreds of videos on school material. I use this for learning in math outside of school. The videos are great quality; thoughtfully planned and packed with information. Each video gets information across thoroughly by presenting it in an interesting and captivating manner. It is a great tool for both excelling knowledge or just for help. This is a very reliable site, because the information has been tested by the many users, and when I myself researched the topics outside of the site I got similar results to what they were teaching me. I would recommend this to anyone who wants personalized learning in the field of their choosing.

I have been using Khan Academy throughout my AP Calc class. It lets you pick the unit that you might be struggling on, watch videos for clarification, and then do practice problems.

Khan Academy where college professors upload videos on what lessons they teach in class. Anyone can access these lessons, and learn about the different subject matters. It has videos on math, English, science, and history.

This videos discussed the differences between real images and virtual images, as well as the differences between diffuse and specular reflections, and even explains refraction and its applications in optics. It also walks you through using focus point definitions of curves to determine what type of image and where it will be or appear to be. Near the end it even shows you some actual calculations about the exact position of images.