No you do not need one. However, if you are selling properties owned by other people and collect a commission, you will need a real estate license. Some choose to work without one but you can get in trouble with the law if you are selling for others and collecting fees for your service.
As mentioned, you do not. I think a lot of people are under the impression that you need it. You only need this when you plan to act as a middle-man for someone buying or selling a home. If you are buying and selling your own properties, no need.
To flip houses, no you don't need one but you are shooting yourself in the foot if you don't have one. Going through the education and testing to get your license is what helps big time. A lot of people fail to really generate huge profit because they never bothered to get a license.
Technically no but it protects you so it is a good idea to have one. I would not sell a house without one, personally. It just comes with risks and a lot of people won't even work with someone unless they have a license.
A property developer is required to get different permits and documents before they can offer any of their real estate project to the public. One important permit that needs to be secured is a License to Sell. This is a home buyer's assurance that he or she will get their dream home.
Yes, you do need one. I am not sure how people are getting away with selling homes without them. 😅