Blog post from one of the best Ashley Willis: https://ashley-willis.medium.com/what-is-developer-advocacy-3a92442b627c
This site should be a first stop: https://devrelcollective.fun/
Check out the resources page: https://devrelcollective.fun/#resources
People: https://airtable.com/shrpRuUQlSu9QKeVn/tbls4XxZE3vIQ9OC8
https://www.leggetter.co.uk/2016/02/03/defining-developer-relations.html
https://slack.engineering/defining-a-career-path-for-developer-relations/