This is the 10635th most frequent Portuguese word.
garantidas
Guaranteed.
Here, 'garantidas' is used as an adjective to express that the spots are certain to be reserved for the first people who sign up.
As vagas para o curso de programação estão garantidas para os primeiros inscritos.
The spots for the programming course are guaranteed for the first enrollees.
In this case, 'garantidas' denotes that the promises are not assured or cannot be taken for granted.
As promessas feitas pelo líder nem sempre são garantidas.
The promises made by the leader are not always guaranteed.
Here, 'garantidos' (the masculine plural form of 'garantidas') refers to rights that are assured or protected by law.