How to shift without the clutch (clutchless shifting)

Disclaimer: I don't recommend using this method for a daily driving technique and I don't take any responsibility for any damage that may be caused from this technique.This is simply just for demonstration purposes and is just something fun you can learn when driving in a manual transmission. A practical purpose for this might be for when you have a slipping clutch. Or if you're just too damn lazy to depress the clutch pedal lol.

When shifting without the clutch you are basically matching the engine's speed with the transmission's speed. When you upshift, the transmission will be going slower than the engine; therefore, you have to let the engine slow down before you can successfully put it into gear.
When you downshift, your engine will be rotating slower than the transmission; therefore, you must blip (give a bit of gas) the throttle to increase the speed of the engine to match the speed of the transmission.