The subjunctive is notoriously difficult to master but its use does tend to follow particular rules. At this level it is important to know and have a good understanding of the folloiwing conditions which require the subjunctive:
NO PIENSO QUE/NO CREO QUE sea sano comer mucho chocolate.
QUIERO QUE/ME GUSTARÍA QUE disfrutes esta clase.
ES IMPORTANTE QUE/ES NECESARIO QUE hagas un poco de deporte cada día para mantenerse en forma.
¡OJALÁ QUE haga sol hoy!
REMEMBER, practice makes perfect and with time, using the subjunctive will become second nature!
¡Hasta luego!