Georgism is an ideology broadly based on taxing the full value of land, in order to prevent rentseeking.

So rather than taxing people for the property they built/bought, you tax the land which no one made.

The value of the land is based on the progress society made in that area, so when you tax the full unimproved value of the land, you prevent landlords from essentially leeching on the results of society progress that they did not directly contirubute to.

You can still buy land, but when you do you must pay full rent to the government, so technically, if the government did own all the land and lease it out for rent, it would be goergist in practice(but not in spirit, since goergism wants to protect property rights)

It boils down to property tax as a means of preventing land accumulation and tax revenue generation.

https://en.wikipedia.org/wiki/Georgism

I don’t see how that would have worked even when it was invented.

Right now you can see how the rich own all the land and have no need to use or sell it. This way they create a shortage and can charge a higher price for the land they use or sell. IMO the only way to break this up to stop charging property tax at all - because all land ownership goes back to the state. If someone wants to use land they rent it from the state. If they do not use or misuse rented land the land goes to a different renter (or to the state).