Oh exciting! Those 11 Airs are super cute! I had a 2012 one for my whole college and masters degrees and it was a good friend, though I’m also aware of some of the quirks they have!
Ok, so for older macs the best info site is called Everymac: I’m guessing this is the one you have -
https://everymac.com/systems/apple/macbook-air/specs/macbook-air-core-i5-1.6-11-early-2015-specs.htmlIt has ALL the info (prob more than you want) - but the last supported OS it lists is
macOS 12 - that’s not the latest, but it still gets security updates and it should run all modern software just fine ^^
You can check what version you have by clicking the Apple logo and doing “about this Mac” - and updates are done in System Preferences.
I know that
@Cobra! does hacky upgrades to unsupported versions of macOS. Iv never tried that and I dunno that I’d actually recommend that for a computer you need to use for school, so I’ll leave it to them to explain if that’s possible!
Extra tips:If you are unsure how old the battery is, I recommend using an app called
coconutbattery, it will show you if it needs to be replaced (most repair shops can do this)
Use Safari instead of chrome/firefox, it tends to be faster on older macs. Generally speaking, Apple made apps work best on macs, or other native indie made apps! There is a
good list here! Avoid Electron apps (like VSCode!)
Sometimes going into Preferences and disabling all of the Spotlight options can help speed things up (but this will also make its search functionality kinda useless

)
Adventurous: reinstalling the latest macOS from scratch sometimes helps freshen up these laptops. This is kinda complex so I won’t go into detail here, but in short (go into Web Recovery Mode (startup holding Option-Command-R), Erase the HD in Disk Utility, then reinstall the latest OS)
Keep a cleaning cloth between the keyboard and the screen when you have it closed; it will stop the screen getting damaged!