Comte, Durkheim, Weber and Marx: one anchor idea per thinker
Almost every high school sociology term traces back to four names. Auguste Comte coined the word sociology and argued for observing society systematically through positivism. Emile Durkheim introduced the social fact, a way of acting or thinking that sits outside the individual and presses on their behaviour, and he separated mechanical solidarity, found where members are alike, from organic solidarity, found where people depend on one another's specialised work. Max Weber focused on social action that carries meaning for the person doing it, using verstehen to grasp that meaning from the actor's point of view. Karl Marx read society through the struggle between those who own the means of production and those who work for them.
The most common stumble is mixing up the thinkers, Durkheim and Weber above all. Durkheim begins with structures that constrain people from outside; Weber begins with the meaning inside the head of the person acting. A one-page grid fixes this quickly: four columns, each holding a name, a keyword, a one-line idea and an example. The queue at the school canteen illustrates Durkheim's social fact, choosing a university major while weighing job prospects illustrates Weber's rational action, and unequal access to private tutoring among classmates illustrates Marx.
Weber also sorted social action into four types: instrumentally rational, value-rational, affective and traditional. Questions often describe someone's behaviour and ask which type it is. A good drill is writing one everyday event for each type, such as shaking hands with relatives at Eid as an example of traditional action.
Once all four thinkers can be named with their keyword and an example, book closed, the foundation of sociological theory is standing.