I can't delete quick time player on my macbookpro

You cannot delete Quick Time Player as it resides on the read-only filesystem in Catalina and Big Sur. Same drill for other Apple applications that were installed by the operating system. Just ignore them if you don't need them.

htwg wrote:

I need to play a movie sent via WE transfer for a class. It won't play on Quick Time Player. How to I get an app that will play it and get Quick Time not to appear everytime I try to watch the movie

You can not delete baked in apps that ship with the macOS.

Try an alternative software...

ex VLC

Official Download of VLC media player for Mac OS X - VideoLAN

You can Control (right) click a file type before opening for a contextual menu>Open With >and set it as the default player