Here are some of the best, but they're aimed mostly at more experienced people. However, watching the vids and reading on these sites can be an eye opener for beginners
Mirai has some free stuff, but the really good stuff is subscription.
We educate bonsai creators, we curate bonsai artistry, and we create trees that connect you.
bonsaimirai.com
Another good source:
www.bjornbjorholm.com
Old school reading, but hands down one of (if not THE) best bonsai info on the web