what makes a hellocopter fly?

Same thing that makes an aeroplane fly...except rather than relying upon foward velocity to generate lift..a helicopter spins it's 'wings' to create the lift...

The pilot controls the rotor's angle of attack to create more or less lift. The engine then keeps (or attempts to keep) the rotor rpm stable.

What does confuse people is how a helicopter moves foward.

In the hover..the airflow from the rotating disc is directly vertical (downwards) To move foward, the pilot 'tilts' the rotating disc foward and the thrust vector is now downwards and slightly aft.....it's this aft flowing portion of the downflow that propels the helicopter foward.

The helicopter is an airplane whose wings rotate. The pitch and the angle assure movement and climb. A common airplane has little to do with the engines, they simply provide thrust. The wings lift. If you make the wings rotate, they lift and provide thrust.

pushing the air down.

plus pushing the air down against the surface. it incereases the power during the hovering in ground effect. the air passing downwards through the main rotor cannot iëscape into the free space, but hits the surface and turns from veertical to sidewards motion., this increases the pressure under the rotor disc and increases its efficiency.

yes the blades push air down causing lift,

That was an awesome answer helipilot212!