@ALep1 Okay, there are actually many ways to know that you should use "Ся": 1) The action is directed to yourself. The meaning of the suffix -sya here is equal to the meaning of: verb + 'self': Example: - Я хотел одеться (I wanted to dress MYSELF up.) If there were no "Ся" then the meaning would be completely different. Я хотел одеть (I wanted to dress (other person, not yourself) - Я люблю прятаться (I like to hide (myself)). Я люблю прятать (I like hide (something or someone, not yourself)
2) The same action is performed by two people or more than two. Each person performs an action and takes on an action by another person. Example: - она любит со мной обниматься (She likes hugging with me). Each of them performs this action. (hug each other) Она любит со мной обнимать (she likes to hug (something or someone else but not the person who says the sentence) - Мы ссоримся (we fight (with each other)).
3) These verbs with meaning: 3.1) Various changes in movement, position,(move, descend, land, return, bend down, stop, decrease, etc.); 2.2) the beginning, continuation and end of any phenomenon or action (begin, continue, end); 3.3) a constant action of an object (for example: that cactus pricks, this tree bends, this dog bites).
4) Verbs that can't be used without -sya: - смеяться (to laugh. There's no "смеять" word) - становиться (to become) - Бояться (to be afraid), - Появляться (to appear) - Нуждаться (to need), etc.
5) Talking about an action that does not depend on the person and happens by itself: - Так случается (it happens) - Становится темно (it gets dark) - Мне нездоровится (I’m sick) - Не спиться (I can’t sleep) ============= Let me know if you need more examples 💕