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I'm really surprised how often the recommendation of "dude, learn how to heel-toe" comes up in this forum. It is a shifting technique used for extremely aggressive driving that involves controlling all three gas, clutch and break pedals at the same time. There is absolutely no need for that in normal day to day driving.
Rev matching on the other hand is important to learn because it reduces wear on the clutch, reduces stress on the engine & transmission and it makes the ride less jerky. Rev matching is about matching 3 variables, engine speed, vehicle speed and gear. Two things can happen if these three variables are too far out of sync: 1) engine speed is too low for vehicle speed and gear, the car loses momentum to drive the engine up to speed and passengers jerk forwards. 2) engine speed is too high for vehicle speed and gear, the car accelerates (possibly spin some tires), passengers are thrown back in their seats. Typically you only have to worry about rev matching during downshifts and you can skip gears all you want as long as you rev match properly.
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