software update
I can't upgrade to macOS big sure, I get the following note Your disk doesn't have enough free space. I don't know what should I do.
MacBook Air 13″, macOS 10.15
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How to free up storage space on your Mac - Apple Support
From: How to upgrade to macOS Big Sur - Apple Support
"If upgrading from macOS Sierra or later, macOS Big Sur requires 35.5GB of available storage to
upgrade. If upgrading from an earlier release, macOS Big Sur requires
up to 44.5GB of available storage. To upgrade from OS X Mountain Lion,
first upgrade to OS X El Capitan, then upgrade to macOS Big Sur.