How to make space to update my macpro ?updates

Hi there! This handy article from apple shows you different ways to clear up space on your mac: https://support.apple.com/en-us/HT206996

Of course, I would like to interject on my answer and let you know that since you are updating your MacBook, I highly recommend you make a backup just in case. This article here shows you how to back up using Apple's Time Machine: https://support.apple.com/en-us/HT201250

You can also move your space hogging movies, videos, photos, etc to an external hard drive and then delete them from your Mac. Also remember that you need to maintain an absolute minimum of 15 GB of empty space for the OS to function properly; if you fill up your hard drive completely, your computer will stop functioning altogether at some point.