1) When city levels up, one can chose a benefit, however, after I chose it, I do not see it anywhere mentioned, not in city description, nor in other places like calculations for output. It should be more visible.

2) Somehow I can not build gardens, or whatever food producing buildings in the cities, I do not understand why. There probably some requirement for that to appear even as a gray item, but I can not even figure it out. I do not know how, but there must be a way to see that something is missing from the city which does not let build some building. May be "show all building structures" in the build menu, and gray them out if there is no resource, but at least there will be explanation why. Like if you have no shard near the city, you will not see shard mining building in the build screen, but if there is "show all" button there, then you click it, and see all the building, you find shard mine and see "shard should be near the city" or something like this. However, this can be solved by "elementopedia" as well (see item 4)

3) I can's figure out how to trade technologies. I mean I see them in the diplomacy screen, but when I agree, nothing happens. May by it is still not implemented. In any case, I think it would be nice to be able to use guildars (or whatever the currency is called( to equalize the deal when the perceived value of technologies is different.

4) Technology tree or some kind of civopedia (elementopedia?). I can not find it. I had a situation when I needed to start building ships, but I have no idea what to research for this. I could not even understand if I should research "adventure" or "civic" or "military", let alone the name of the technology that gives me ability to build ships (do I need a seaport for that?)

5) When in build mode in the city, and if you click on another city, that other city should be selected and you should be in that other city build mode.