I Want To Be A Voice Actor by Dee Bradley Baker - This website is a great resource whether you are just starting out or are already working in the field. It also keeps getting updated.
Skillshub This site combines easy access to vetted coaches, community workout rooms, forums, pathways for various genres of work, recorded discussions on relevant industry topics, short interviews with coaches, and reasonably priced classes. There is a subscription fee but it is so worth it.