Don’t hand out personal data if you don’t have to. If you are asked to  enter or give out your email address, ZIP code, or phone number, you can say no.
Peidiwch â rhannu data personol os nad oes raid i chi wneud hynny.  Os oes gofyn i chi roi eich cyfeiriad e-bost, cod ZIP, neu rif ffôn, gallwch ddweud na.