hotkeys

It’s become quiet here… Has the issue not been resolved yet?

This depends on how much free time the developer has. Judging by the lack of updates, he doesn't have any right now.

As for what to look at in order to improve your skills, here are some links:
/topic/8914/
/topic/3588/
/topic/3574/

and among the recommended ones, for ознакомления (acquaintance), there is also this:
/topic/6313/
/topic/10574/

as well as
The essential guide that every Heroes player should know, at least 90% of it