HERE Crash Course goes over briefly what resonance is, and gives an example, and delicious analogy, about them. However it should be noted that in this class we will use dashed lines to represent the P(PI) bonds that divide out averagely. In short, resonance occurs when the Lewis Model offers multiple correct models, and the real structure has an average of the extra.
Mason, I found your post very informational. I like how you started it by explaining what resonance is to establish the new concept. Then, you showed an example and clearly described how the extra bond is split evenly between the rest of the bonds. Finally, the video you left a link to was very helpful, as it showed different resonance structures of varying sizes and talked about the history of the subject.
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