In Excel you want to have a sheet that can not add any columns and rows, what should you do?

apply the password and add columns and rows according to the requirements.

1. go to review 

2.click on  protect sheet select format rows and format columns and set password

u don't have to go to protect sheet and add a password there is another easy way follow my questions to find the answer

Hello, you should know password and after you will enter it, you can do you need

mohamed shafi answer is right.

protect the sheet by password , but there is some programms can violat the protection