Khan Academy is a very useful youtube video channel that provides walkthroughs on certain topics regarding math and sciences. In the video embedded Khan academy explains how to solve a simple physics problem of calculating average velocity. In each slide he carefully writes out each step and then shows you how to do the math part of the problem separately.
The video enhances your ability to learn the topic in a number of ways. The first one being the fact that you can rewind and review certain topics with ease in opposition to asking a teacher and feeling like you are wasting someones time as mentioned by khan himself in one of his ted talks. Another way the video enhances your learning ability is the fact that each step of the problem is done at a certain point in the video so its easier to follow and not as sporatic as a lecture would be.