If you’re just looking for a good book, I recommend Michael Caine’s “Acting in Film”. It’s a great book, very well written and easy to understand. I always find myself coming back to it now and again. https://www.amazon.com/Michael-Caine-Applause-Revised-Expanded/dp/1557832773/ref=mp_s_a_1_2?keywords=michael+caine+book&qid=1559566849&s=gateway&sprefix=michael+cain&sr=8-2 Amazon link 👆
I learned a lot by reading Michael Caine's book on acting. I never would have thought to learn about directing from that book, but I asked an acting teacher the same question you've posted here and that was her immediate answer.
To be clear, it's not like he discusses how to direct actors in the book. He just explained what actors go through and what actors tend to need during prep and on set in a way that was helpful to me.
Michael Caine - Acting in Film: An Actor's Take on Movie Making (The Applause Acting Series) Revised Expanded Edition https://www.amazon.com/dp/1557832773/ref=cm_sw_r_awd_Szf.ub0DNA53A
Edit: sorry for whatever that price zombie bot post is. I'm new here and didn't know that crap would happen if I posted a link.
His book "Acting in Film is brilliant. I am not an actor and do not intend to pursuit acting in any way but a former roommate left it when he moved away and I think I read it in one sitting - it was very interesting. The principles he outlines in that book translate to many life situations. Learned a thing or two about film as well...
Michael Caine on blinking: https://youtu.be/UTMRufBXhC
I think it's less about conveying a particular emotion and more about grabbing the attention of the viewer. He talks a lot about the camera so I assume this advice is specific to film acting instead of stage acting.
My husband majored in theatre and was the one who told me about the blinking thing. Michael Caine's book on film acting was one of his textbooks!