when you can use at and in when you talking with a someone
متى استخدم كلمه At او in عندما تتحدث مع شخص ما اتمنى الاجابه باللغه العربيه
Use at to say something is located at a particular/specific place or time. For example, Meet me at school. Meet me at 10am.
Us in to to say you are inside something (either physically or a timeframe.) For example, I am in the hospital. Meet me in one hour.
I is confusing and you can often use at and in interchangeably. For example, "I am at school" or "I am in school" are both correct.