Workaround for Old MacBook Air maxed on storage
Workaround for maxed out memory
MacBook Air 11″, macOS 10.15
Do you mean memory (RAM) or physical storage? They aren't synonymous.
To free up memory (RAM), close apps you're not currently using.
To free up storage, you will need to delete old files and/or apps, buy iCloud storage, or transfer files to an external storage device.