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Here's another very important tip for beginners.
If you haven't had time to transfer any of your hero assistants (so that the main hero can move quickly on the fastest unit), and there's a stone or wood mine nearby, you can enter it, leave all unnecessary troops there to guard it, and stay on the fast unit so that you can move faster the next day.
This is done as follows: enter the object, press "space," and leave behind everyone you don't need until the start of the next turn.