This is important because it will help you understand the “flow” of the energy during your spellcasting. Some spells draw energy towards you, release energy from you, or banish energy. These are “receptive” spells.
Projective spells include anything that sends magic up and out for the purposes of manifesting, creating, or wishing.
If you don’t know what to label your particular spell, just pick what energy feels the closest to your intention. The most important thing is to know where you’re sending energy or where you’re receiving energy.