I have iphone 11 but i forgot the icloud id and password so please help me what i do now

Have you forgotten your Apple ID?, Check your Apple ID via your email box, see this Apple article: If you forgot your Apple ID

If you forgot your Apple ID email address or phone number - Apple Support                  

OR see -> Having trouble signing in?

https://iforgot.apple.com/password/verify/appleid

If you've forgotten your Apple ID email address or phone number

If you've forgotten your Apple ID email address or phone number – Apple Support (UK)

Have you forgotten your password? -> See this Apple article: If you forgot your Apple ID password

If you forgot your Apple ID password - Apple Support

Then see this Apple article: What to do after you change your Apple ID or password

What to do after you change your Apple ID or password - Apple Support

See also -> If you can't connect or sign in to iCloud

If you can't connect or sign in to iCloud - Apple Support

Call Apple in your region see: Contact Apple for support and service

Contact Apple for support and service - Apple Support

Contact Apple Support -> Get Support (apple.com)