OS X version 11
How can I update my MacBook Pro from OS X EI Capitan to Mac OS
Ventura
How can I update my MacBook Pro from OS X EI Capitan to Mac OS
Ventura
When you find out what Mac you have, you can download the appropriate macOS here: How to download and install macOS - Apple Support
When you find out what Mac you have, you can download the appropriate macOS here: How to download and install macOS - Apple Support
Whether you can update or not and to what version of macOS, depends on exactly what model Mac you have.
OS X version 11