TALK SPEAK TELL SAY 4個字在用法的分別?

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I talk to them = you communicate with each other& do enjoy the talk too.
I speak to her about you or I tell her about you = you inform her something or simply notify her something
I tell her not to go out during typhoon time - I advise her not to go out during typhone time.
I tell her to stop bulling her brother -tell can mean order, which is with stronger sense
My mother says that she has told her about you. say is to tell you what she is talking about.
Hope it is clear to you.