How to learn mobx and how to build the architecture correctly?

Question

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In general, there is a lot of material on Redux, examples of playlists on YouTube. Actually, what can not be said about mobx ... I would like to understand it as much as possible, if anyone has any bookmarks on this topic, please leave very little very little information on MOBX !!! Articles videos can mini courses (free) Thanks in advance!!!! I tried to figure it out at the office. website didn't work
And the second point, which I do not understand at all. Here I have some kind of stor. I have a question. The procedure for interacting with the server. In fact, all data is stored on the server!? In databases, etc. Accordingly, the first action in using the state manager, when loading the first page (for example), first of all, a request is made to the server to obtain data, then is it drawn? and Accordingly, everything that enters the store during actions on the client is immediately sent to the server in parallel with rendering?