R/ship,courtship,friendship,marriage?

Pls nls,kindly define&critically analyze friendship,r/ship,courtship,engagement,concubinage&marriage.

to my own knowledge, friendship is a cordial relationship between 2 or more people,either male to male, female to female or female to male,relationship as it termed is dating and it between male and female, courtship is another level in relationship, it is when both party has agree to get down the aisle with themselves and both family are now aware and marriage is legal and or customary agreement to stick to one another for life by each partner.