Najdorf sicilian - overall ideas

Hello

I am looking for a book about najdor but book that is more about overall ideas (plans etc) of this defence than pure theory.

Could you suggest me any titles?

Fundamental Chess Openings by Paul van der Sterren covers all openings in order to give you the basic ideas and principles behind them.  Since you haven't played many games here going by the ratings I saw at your home page might be a mistake, but if they're anywhere near correct the last thing you need right now is specialized opening books. You don't even need FCO for now and should probably consider one or more of the following instead

Common Sense In Chess by Dr Lasker

Anything by J R Capablanca

Logical Chess Move by Move and/or The Most Instructive Games of Chess Ever Played both by Irving Chernev

I could add "Modern Ideas in Chess" by Reti (the ideas were "modern" when the book was published, in 1923, and are still applicable), and "My 60 Memorable Games" by Bobby Fischer. Plenty of Najdorf games in that book, and a wealth of other useful information.

At the moment i have almost 1900 elo rating, but i know only first few moves in french defence and few moves for d4, i dont know theory for openings and if i play with better players i cant get anything good from position due to my lack of knowledge.

I do not have time for memorize hundreds of moves in najdor but i think that first few moves (1-10, 14)   basic ideas of position and plan could improve my game.

Emms is one of my favorite authors and the Starting Out series is generally good.  I think what you are going to find out is that the Najdorf depends on long forced variations and you won't get far with overall ideas.  The basic idea of the Najdorf is that Black makes useful waiting moves, and waits for White to commit himself, before Black chooses where to place his Queenside minor pieces.  This gives White a head-start in development and Black must play very accurately.  It takes considerable judgment and memorized lines for Black to survive.  I don't know what your chess experience is, but the Najdorf is probably not a good choice for someone under the master level.  I have read Emms' book on the Najdorf (Play the Najdorf: Scheveningen style).  In that book he advocates always playing ...e6 (a true Najdorf addict will play ...e5 whenever possible.)  this medthod will always give you the Schevenigen pawn structure, and once you have mastered that, you will have a firm platform to later branch out into typical Najdorf lines with ...e5 (I would make the switch to ...e5 lines incrementally and not all at once).

One of the reasons I play e6 in the Najdorf is to open up the diagonal for my dark square bishop so I can have it ready and aimed at h2 for when white castles his king right into it (which he almost always does.)

I'll second Nimzoroy's suggestion of the FCO.  Great book.  Shows and explains the major plans for both sides.  If you're almost 1900 you're more than ready for it.  Reuben Fine's "The Ideas Behind the Chess Openings" is a wonderful old classic in the same vein, but it is more than a little dated.  Still worth reading and not just for an understanding of how the game has evolved, but FCO is overall a better book.  Too bad you're not a diamond member as GM Shankland has a 6 part video series that lays out the critical lines.

The Scheveningen: Move by Move and Play the Najdorf: Scheveningen Style are both excellent.

Most Scheveningen lines have an ...a6 in  them and are somewhat interchangeable with Najdorf lines...

I like your post, but you make it sound like the Najdorf with e6 is easier to play. I would say the Scheveningen structure is even more dangerous because it allows so much space and freedom of movement to white. There's a reason why people accept the d5 hole, and that is that not having pawns in the centre can lead to wild all-out attacks by white.

Having said that, I do play the Najdorf always with 6...e6. It just makes more sense to me.

There's much more need to study theory than in other openings, yes, but eventually you do get used to the Najdorf and you learn the common themes and how to play it. Main problem is that these varies a lot depending on what white does, a move that is good in one variation can lead to a disaster in another.

But if you have the will (and time) to study a good amount of opening theory I would recommend it even at lower levels e.g. 1600 OTB should be enough.

It is true that in many Najdorf lines ...e5 makes it harder for White to mate Black, but I think that in ...e6 lines natural looking moves are more likely to be correct.  There are some lines where ...e5 shouldn't be played, particularly: 6.Bg5 and 6.Bc4.  Ftacnik in his book on the Sicilian states that "The Scheveningen system represents a a kind of foundational core, from which virtually all knowledge about thematic Sicilian structures and plans can be traced." 

OP seems to be an experienced player, but new to the Sicilian defense.  Starting out trying to learn a main line Najdorf system would be a monumental task.  I think it would be much easier to learn to play a Schevenigen system first where he would consistently have the same pawn structure and many common thematic ideas.  Learning the Scheveningen is no small project and would be all he could handle for a couple of years.