Real estate, or land, is real. It is something all people need. You need a place to put your feet. Sure there are still some nomadic peoples wandering around on the planet but that simply means they don't really own anything. They just wander around with the shirts on their back. Real estate is something people need, will pay for, and will fight and die for if necessary. Most other forms of money come from real estate.
Methods of making money
Farming (the next oldest profession)
Renting (selling land for a time)
storing something for others (like renting but people don't get total access to your land)
Mining (Now you need mineral rights)
camping (buy and wait till the value goes up)
Some people here in Korea buy a piece of land and put in a 10 story concrete structure. Then when an apartment block wants to build next door they have to pay for the sunshine they would deprive your building of.
Of course the main thing to do here is to get land people want or get people to want your land. There are parts of the coast of Chile which are really dry right next to the ocean. I would like to get a portable desalination plant, one that could run on solar power, and ship it to a piece of desert and then create my own oasis. The land value would rise. I could start a farm. Then a resort, as it is so pretty on the ocean.
