No affiliation, acloud.guru has amazing AWS courses, often on sale on Udemy. I paid about £10 a course some time ago and found it very useful.

Slightly self-promotional, but https://github.com/open-guides/og-aws has been helpful to a lot of folks.

I'm currently doing this course to complement my knowledge of dev/architecture on azure. Seems pretty good so far and free if you don't want a cert.

https://www.edx.org/course/aws-developer-building-on-aws

You might find this helpful. I'll probably use it for review myself, before I take the certification test.

https://news.ycombinator.com/item?id=19557489