I have watched over the years a couple of videos proposing different ideas of how it was done. This one seems the best out of those. Not saying I believe this one but it is an interesting watch.

My attempt at explaining for those that don't want to watch. The author has noticed that in the different quarry pits the ramps were about 5.5M wide and some of the older step pyramids have features that are also about 5.5M wide. And different aspects of the King's and Queens Chamber in Cheops are a multiple of that number. He then takes a few older theories about the use of ramps and pulleys to hypothesize that elements like the shafts, the grand gallery etc would line up with a simple internal "machine" he draws out. The 5.5M number is important not because its a religious number but that was the limit of what could be moved by their technology and muscle power/counterweight mechanism.

His best evidence of this in my opinion is egyptologists mapped the size of each layer of stones bottom to top. The layers are not uniform and will go large to small then large to small etc and he argues that the machine as he has laid out would require being set up several times and for each set up the bigger stones would be moved then smaller until everything was moved up a level and the process would start over. Difficult to describe, easier to understand in graphic form.

"Occam's Razor is a principle, often attributed to the 14th-century philosopher William of Ockham, which suggests that when faced with multiple explanations for a phenomenon, the simplest explanation is usually the best. "

Pure muscle power and simple ramps can explain everything.