Nobody has so far given you a serious answer, so:

Cutting - They only had IIRC bronze, which is not enough on its own to cut through the granite. However using sand to add friction makes it cut significant faster/easier.

Moving miles - Boats are incredibly capable of carrying heavy loads with minimal energy expenditure to move said boat. Using logs and levers also goes far.

Getting to the too of the pyramid, that’s a little more of a mystery. But there is evidence they included ramps within the structure as they built the bigger ones as they went. And IIRC the smaller ones had pulley systems going through the center.

It doesn’t require fancy tech, just of patience and application of basic physics.