What is social stratification and what are its criteria?

Stratification is the existence of certain groups (strata) in society, a type of social differentiation, with the presence of a hierarchy among the social entities of a given system.
Stratification is based on natural and social inequality. The criteria for separation are education, income, prestige, social functions, rights and obligations, attitude to power, professional qualification level.
Each stratum covers people with approximately the same level of education, income, and lifestyle.

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.