أنشئ حسابًا أو سجّل الدخول للانضمام إلى مجتمعك المهني.
This is a very vague question. First of all there is a function known as remove duplicates. This will remove all duplicates in a given selection of data. However you will have see its relevance to your sheet. This is useful if there is only one column of data. However in case of mulitple columns, other options such as concentate would help.
conditional formatting
Remove duplicates (formatting)
