It is different for different verbs:) It can be used: 1. sometimes to mean reflexive action: торопить - to hurry someone торопиться - to hurry 2. sometimes to mean mutual action: целовать - to kiss someone целоваться - to kiss (about a couple). 3. sometimes to mean passive: читать - to read читаться -- to be read as in: 'the book is easily read' to read as: "Arabic reads right to left' 3. Somtimes just to make the verb INtransitive: целоваться - to be occupated with kissing. волновать - to agitate, to alarm (someone) волноватся - to worry. Exact change of the meaning depends on the verb.... SOme can be used in several ways: чесать - to scratch, to comb чесаться - to scratch oneself чесаться - to itch And some change meaning: cf. 'to itch'. It has a new meaning. Consider it just a new verb. But the meaning 1.) is the one which can explain the others: -ся means "self", it is a shorter form of "себя"

Just google what is reflexive verb and reciprocal verb -ся shows that action is directed to the subject itself мыть (to wash somebody or something) мыться (to wash oneself)

"glagol" (sorry that I can't type in the Cyrillic alphabet on this computer) is not itself a verb. That is, it is not an infinitive or conjugated form of any verb (for example, "to read" (chitat), "to speak" (govorit), "to write" (pisat). It is not a word that describes an action, state, or process. Instead, it is a noun that means "verb." That is, it refers to a part of speech. Other parts of speech include, for example, adjectives, pronouns, prepositions, etc. "Glagol" is conjungated like other masculine, hard-stem nouns. The ending "sa" at the end of some verbs is a reflexive suffix. It is never added to nouns.

بصراحة سؤالك صعب باانسبة ايا، بس هحاول اشرحه لك مصﻻ يقولون الناس في السعودية كذا: انا انولدت بمدينة جدة Люди в Саудовской Аравии говорят так: я родилСЯ в городе Джидда اما في مصر الناس بتقول كدا: انا اتولدت في القاهرة Что касается людей в Египте, то они говорят так: я родилСЯ в Каире مراتي ولدت البنت Моя жена родила девочку Таким образом, ولد = родил انولد او اتولد = родилСЯ اتمنى تكون فاهمني :) شايف الفرق؟

https://en.wikipedia.org/wiki/Reflexive_verb