If you are just getting into tricking, start here. These moves are quite easy to learn but will build the foundation for many other tricks that will follow. Most of these basic skills don't require any prerequisite skills, so you can just start right away with whatever you choose.
These tricks are very basic but that doesn't mean they are easy for everyone. They do require practice but each one of them unlocks many other tricks for you to start learning. That's why they are at the base of the tricking tree. And a strong tree can only grow tall with a strong base.
Most of these tricks require at least one or two prerequisites. They build directly ontop of the basic tricks. You can usually start to learn these if you can do one or more of the basic tricks. For example: If you can do the 540 and Raiz, then you can try to learn the Sideswipe.
These tricks are advanced because their prerequisites are either harder or the tricks themselves are more technical. They absolutely don't have to be hard if you have a solid base. Scrubba for example is not a hard trick at all, but it requires you to learn Touchdown Raiz first, which is the harder part.
These are actually hard and require a lot of drilling to make them consistent. You will see these tricks not as often and clean execution of them is very impressive.
These tricks are hard by themselves and require hard or technical prerequisites. Make sure you have the prerequisites on lock before you start to learn these, to minimize risk of injury.