Writing statement of research interest for applying for PhD - what to include?

hello everyone
I am trying to write a statment of researsh interest for applying for PhD. I dont know how to write it and what to include in it? what are the topics I should write about? can anyone kindly guide me

PhD??
Where, When, What, Why and How?

Use that as your guideline to brainstorm.

Nobody can help you because we don't know what is your major. Are you going to do research in moon rocks or baby diapers??

Is your school in kabul, Afgahistan or Tokyo, Japan?

Buddy, if you don't know the topic. PhD is not your cup of tea. Sorry.