What is the format for letter …

Informal:-

Sender's address

Date(without leaving a line)

Leave a line

Salutation,

Introduction

Body

Conclusion

Subscription(without leaving a line),

Your name.

B,38 Agnipath Apartments,
211001, Allahabad, Uttar Pradesh
India.
November 22, 2017
Dear Shreyas,
How are you? I hope you are doing fine, here mother and father are also doing well. It’s been a while since we got in touch so I finally decided to write you a letter. You seem to be having such a great time in your new college and city that you chose to stay back in college even during vacations.
Yesterday father paid your credit card bill, he didn’t say a word but I could sense how disappointed he was! Not like an elder sister but a friend I would advise you to check on your expenses. I understand the enthusiasm of being all by oneself in a new city, the fun in roaming around with friends as I have been there and done that. It is good to step out in the world and live to the fullest but at the same time, we have to be judicious.
Parents are willingly paying for all the expenses as they don’t want you to lose any opportunity and experience but it is you who should be taking care of how wisely the money is used. Try to be holistic in approach and define your priorities. Chalk out a list of your daily expenses and strike out all the unnecessary once, try to stick by the list for a week or so gradually you will be able to cut down the extras.
As they say “a penny saved is a penny earned” therefore, handle the money given to you with maturity and yet continue to live life king size as the best things in life are free. At the end, I would like to wish you all the luck with your studies and other endeavours. We all miss you badly so try to come as we all can’t wait to see you.
Yours Loving,
Shreya