Hello, i can't open any apps on my macbook air or install any app

Hello, i can't open any apps on my macbook air. when i am attempting it says "you may need to reinstall app but when i am trying to reinstall it doesn't do anything. i can only browse right now. It happened right after when i deleted some files i was trying to uninstall the useless app and i think i accidently deleted some system files. Right now it is letting me to download the app but i cannot install any of the app or even open any application. please help

If you don't already have a current backup, back up all data, then reinstall the OS. You don't need to erase the startup volume, and you won't need your backup unless something goes wrong. If your Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
There are ways to back up a computer that isn't fully functional. Ask if you need guidance.
If you installed the Java runtime distributed by Apple and still need it, you'll have to reinstall it.

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