The link is pretty good. If you get it, then you probably dont need to listen to my analogy to help people understand how to use timing.

if you are standing in one spot and a friend of yours is on a merry go round that is accelerating and your job is to throw him a ball you will have to do a few things. You will have to throw the ball to him sooner the faster he goes. Once he is going pretty fast your arm will be reaching its limits. The harder you throw the ball the harder it will be for you to return your arm back to neutral and load another ball to throw again.

fixed timing means you pick an average distance to predict when you throw the ball across all the speeds.
Dynamic timing (boost and turbo) means you can shift the prediction across a range of rpm but more finite control