It is not a scam. You evidently received an offer for a one month trial.
Free trial
My friend is telling me that the offer state that it's a 7-day free trial, and first you have to buy a year or month plan, then only that they will offer 1 month free.

They make it very difficult to cancel!!!
It's pretty easy: https://support.chess.com/article/585-how-does-membership-renewal-work
Is it real or a scam ??
It said it would give me a 1-month free trial, And I heard from my friend that they would deduct the money in 7 days. So can you tell me when they will deduct the money from the account? Is it 7 days or in a month??