Can anyone explain the type 1, 2, 3 civilizations to me?

Question

Can anyone explain the type 1, 2, 3 civilizations to me?

Answer 1

I just gave an answer about the Kardashev scale a few days ago.

Type 1: A civilization puts all the energy reaching the Earth's surface to use

Type 2: A civilization puts all the energy coming from its solar system's star to use

Type 3: A civilization puts all energy produced in their galaxy to use

Mankind is Type 0 as we have yet to make full use of all of Earth's energy sources. Altering the scale puts mankind at about Type 0.7 as I have heard, but this sounds too high to me.

Some have also suggested adding a Type 4 for harnessing all the power in a cluster of gallaxies or a Type 5 for an entire wall of galaxies.

Personally I find the scale a little far fetched. Type 1 seems plausible but harnessing all of a star's energy seems implausible. A dyson sphere could do it but I find a dyson sphere to be similarly impossible. Harnessing the energy of every star in a galaxy just seems ridiculous. But what do I know, I'm only a scruffy primate.