URGENT HELP NEEDED!

Please tell me how to set up the site so that certain information (pages) can only be viewed by registered users? For example, there is a table, and to see more detailed information, you need to follow the link in the table - for registered users. If not registered, then the link does not work! I WILL PAY FOR HELP! I WILL PAY FOR HELP! I WILL PAY FOR HELP! I WILL PAY FOR HELP! I WILL PAY FOR HELP! I WILL PAY FOR HELP!