A few ideas for some things that might be helpful

coderoad lesson : add a single new lesson to the yaml and markdown that matches the one before it, except changes the L#'s
coderoad lesson -# : add many new lessons to the yaml and markdown that matches the one before it, except changes the L#'s

coderoad titles : this would extract all the titles from the markdown and display them in the terminal - I made a short script to do this for me already