What are the steps for writing a perfect cover letter?

[deepika-rajput-a9c8e139 (Deepika Rajput)]

What are the steps for writing a perfect cover letter?

[vishali-bhardwaj-a5631138 (Vishali Bhardwaj)]

Address to a relevant person. Write about your professional summary in max 400 words. Summary should be such that it should be able to create image of yours. Do proof reading. Check for grammatical errors