I'm the content lead for web.dev. Just wanted to give a quick shout out to the people who made this happen because it's not clear on the site. I think this is also useful information because you'll see that a lot of CSS experts we're involved in this project.
Adam Argyle [1] and Una Kravets [2] created the podcast series. Una mainly drove the overall project to convert the podcasts into this written series. Adam provided technical reviews on the written content and I also believe he created most or all of the self-assessments (i.e. the 'check your understanding' quizzes). Andy Bell [3] wrote all of the content (and demos, I think). Rachel Andrew [4] edited all the content. Rob Dodson drove the engineering work behind creating this new "courses" infrastructure on web.dev. I was hands-off on this project so I may not have gotten everyone's roles exactly correct, but I do know these were the main people involved.
Adam Argyle [1] and Una Kravets [2] created the podcast series. Una mainly drove the overall project to convert the podcasts into this written series. Adam provided technical reviews on the written content and I also believe he created most or all of the self-assessments (i.e. the 'check your understanding' quizzes). Andy Bell [3] wrote all of the content (and demos, I think). Rachel Andrew [4] edited all the content. Rob Dodson drove the engineering work behind creating this new "courses" infrastructure on web.dev. I was hands-off on this project so I may not have gotten everyone's roles exactly correct, but I do know these were the main people involved.
[1] https://twitter.com/argyleink
[2] https://twitter.com/Una
[3] https://twitter.com/piccalilli_
[4] https://twitter.com/rachelandrew
[5] https://twitter.com/rob_dodson