AWS would be the next, where they provide this exam readiness course, which serves as an introduction and overview, but I definitely wouldn't say is exhaustive and a single stop for the exam. To be ready for the exam, requires in addition to strong ML basics, thorough knowledge on the ocean of cloud ML offerings AWS has. And being the oldest cloud layer, the ocean is wide and deep. Especially, the data engineering offerings took me a while to wrap my head around the number of alternate instances and services being built for the same overlapping use cases, with only minute differences.