macbook update
How to update my macOS High Sierra from version 10.12.5 to version 10.15 or version 11
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Does macOS 10.15 or 11.x even support your exact model Mac? You will need a 2012 to mid-2019 Mac for macOS 10.15, or a Late-2013 to 2022 Mac for macOS 11.x. You can use the following article to see which versions of macOS are compatible with various Apple hardware:
https://eshop.macsales.com/guides/Mac_OS_X_Compatibility
It is a good idea to post the exact model of your Mac when asking for assistance. You can get this information by clicking the Apple menu and selecting "About This Mac".
You can finds links to various macOS installers within this Apple article which also includes optional instructions for creating a bootable macOS USB installer:
How to create a bootable installer for macOS - Apple Support
Make sure to have a good backup before attempting to upgrade macOS in case something goes wrong (assuming your Mac is even capable of running a newer version of macOS).
You should always have frequent and regular backups of your computer and all external media (including the cloud) which contain important & unique data.