brew upgrade I get some errors that I'd like to resolve.
xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun
I'm fairly new to terminal and have no idea what this is or how to fix it.
The next one is:
Error: Could not link: /usr/local/share/doc/homebrew
Please delete these paths and run 'brew update'.
How, exactly, do I delete paths?
Also, would you recommend some introductory to intermediate reading on how to use terminal?