When you think "how do i update my mac operating system?," you should also be thinking about how to prepare your Mac for the update.
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When you want to upgrade macOS, keep in mind the latest version of macOS is only available for these models: Note: To see how much available storage space you have, follow the two step process above, then "Storage" tab at the top of the window. These are important to know, as upgrading to the latest version of macOS – macOS 12 Monterey – requires 26 GB of storage if you are upgrading from macOS Sierra or newer, and up to 44 GB of storage available on your Mac if you are upgrading from an older macOS. This will tell you what year your Mac was made, the version of macOS or OS X you're currently on, the computer's RAM (Memory), processor, and which graphics card your Mac has.