HOW CAN I UPDATE ONLY SAFARI FROM MAC OS EL CAPITAN?

The way Safari is updated is by upgrading or updating your computer's software. An upgrade is when you install a newer OS version, such as upgrading from Catalina to Big Sur. An update is to install a newer version of the same operating system. The reason for this is because Safari is installed as part of the operating system. It cannot normally be individually installed. Incidentally, a newer version of Safari does not always work with every web site. Sometimes it is necessary to install another browser such as Firefox or one of the many browsers available from the Apple App Store to use with certain web sites. They are individually installed and upgraded.

Can not.

Have to upGrade the Entire Operating System to get a newer version of Safari.

If you're using Safari 11.1.2, you can't. Otherwise, check for updates in the Mac App Store.

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