If you are using Codepen free or paid you need to check this out.

This is an offer from yoDEV.dev , a latin American dev community. They also offer a cool feature called code mentor. When you are on the site and mouse over a code block you get the normal "copy" button, but there is another button called "explain code" if you click this it opens a modal with the option "what would you like help with ?" .. Understand ? Debug? or Review. Select from three experience levels Beginner, Intermediate and Advanced and the response language is available in English, Spanish, and Portuguese (as well as the site)

Give them a try. It is a 100% free site.

*full disclosure. I am a partner as well as a happy user !
Cheers !