Transitions are automatically created when connecting two states. They are sorted based on priority with the lowest number evaluating first.
Can Enter Transition
The primary condition logic of a transition. This must consist of pure Blueprint functions and evaluate to true or false.
On Transition Entered
An optional node which will only execute if this transition has evaluated to true and is being taken to the next state.
Clicking on a transition will let you configure any properties of that transition.
Lower numbers take priority. They are sorted once on State Machine initialization and evaluated in that order. Once a transition evaluates to true processing will stop and that transition will be taken.
It is possible to have a state link to itself. Right click on the state and choose Link to Self. This transition will evaluate like any other transition and the state will call its End logic and then call its Begin logic.