As a new cursor user, What's Prompt is good for coding in Cursor?

Hi everyone !

I am a new cursor user, I see a a lot prompts at Internet like cursor.rules

I have some confusion. What’s the best way for Usage in Cursor ?

Does we real Need Prompt when begin coding with LLM?

I haven’t used it yet, I think when AI provides wrong code many times, or non-existent methods and dependencies, you may need to add rules