HI, Bill Raymond thank you for your videos , I’ve followed all the steps to install Jekyll on MacBook M1 apple silicon MacOS Montery v 12.01 but I’ve this error message when I want to install ruby@3.0. Please help Thanks 
mac@MacBook-Pro ~ % ruby-v
zsh: command not found: ruby-v
mac@MacBook-Pro ~ % ruby -v
ruby 2.6.8p205 (2021-07-07 revision 67951) [universal.arm64e-darwin21]
mac@MacBook-Pro ~ % brew install ruby@3.0
fatal: Could not resolve HEAD to a revision
Running brew update --preinstall…
==> Auto-updated Homebrew!
Updated 1 tap (homebrew/cask).
No changes to formulae.
Warning: No available formula with the name “ruby@3.0”.
==> Searching for similarly named formulae…
Error: No similarly named formulae found.
==> Searching for a previously deleted formula (in the last month)…
Error: No previously deleted formula found.
==> Searching taps on GitHub…
Error: No formulae found in taps.
mac@MacBook-Pro ~ %