This is the 581st most frequent Catalan word.
aplicar
To apply.
Here, 'aplicar' is used in the sense of implementing or putting into action a set of rules or procedures.
Cal aplicar aquestes regles per completar l'exercici.
These rules need to be applied to complete the exercise.
The usage of 'aplicar' here refers to spreading or laying a substance over a surface.
Vaig aplicar una capa de pintura a la paret.
I applied a coat of paint to the wall.
'Aplicar' in this context means dedicating oneself or putting effort into an activity, emphasizing self-commitment.