Where can I read the features of Google Cloud Services, Amazon Web Services?

Question

Cloud computing

Further, the words Google and Amazon suggest a generalized mention of the companies' cloud services. So far, only for myself I began to study Google. I knew about some features of Amazon before: I accidentally read it, heard it, used it a little.
Everyone, of course, will exclaim - why, there is official documentation.
But it seems to me that it is not very convenient and often you have to read a lot or not quite to the point. The answer is often found stupidly by googling with links to the office. to the dock or to responses from the stackoverflow, etc.
Here are some features of Google's work: Globally blocks mail standard ports 25, 465, and 587, so most mail services do not work, while Google unobtrusively offers to use SendGrid. For a long time I could not understand how to use tags in network settings and how they are tied to specific instances and so on.
I did not find good thematic blogs (rus / eng) on ​​this topic or at least where some practices in settings are considered. Advise something other than documentation?