Answer:
Dating - a date is the first step towards an important commitment with someone and is necessary to help you build a relationship with your partner, learn to connect to them, and see the expectations of both parties align.
Courtship - Courtship is important because it allows couples to develop trust and unconditional love (by expressing their love for one another in a variety of creative ways other than words) both of which are p for a stable marriage to exist.
Engagement - This phase is crucial and happens (to allow for adequate wedding preparation) when two people have made a commitment to go all the way into marriage.
Cheers!