Those learning languages must learn rules about how to order words. sociologists call those rules

Sociologists call those rules "norms".

Norms characterize how to carry on as per what a general public has characterized as good, right, and critical, and most individuals from the general public cling to them. For instance, when purchasing food or boarding a transport. These models portray the noticeable and imperceptible standards of conduct through which social orders are organized, or what sociologists call norms.