A really good book that explains strategy in plain, simple language is by Jeremy Silman & is called Reassess Your Chess. Go through it twice, back to back, so it sinks in good. Follow this up with The Amatuers Mind, by him also. Again, back to back. I understand he wrote an endgame book also, I'm sure it's of good quality. There's also The Art of The Middlegame by Kotov. But there's a LOT of good books on piece deployment. Study pawn structures, it will guide you in figuring out where the pieces will be best placed depending on the structure. Plus, this very site has a tremendous amount of instruction videos & articles. There's also Chess Mentor on here. I'm going to join it as a paying member soon but even the free version I'm using now can be instructional if you use it. Just browse around for a while, there are good learning tools right here
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Thanks Dafonzzz, but I have no money to buy a books.

I'd say he is!
You should be an expert at this now Kurogkug!
I think I am an expert now Borg. Only because I think I know now what is the meaning of ''strategic position'' and not how to strategically position my pieces. And that is ''a position based on strategy''.
Can you double check if this is correct?.
In the movie I.D.
Strategy of the aliens = to kill all the leaders of earth.
Strategic position = the aliens strategically position their crafts, over targets (all the leaders of earth), so that it will based on their strategy (to kill all the leaders of earth).
In chess Board
Strategy = to win those black pawns or otherwise convert the position to a clear and easy way.
Strategic position = The knight on d4, blocking the black d pawn from advancing and attacking c6. Therefore, the knight on d4 is in strategic position and the knight position on d4 is based on strategy ( to win those black pawns or otherwise convert the position to a clear and easy way).
So, I'm I right or wrong Borg. I' ll wait again to Borg.