I was white and i tried to defend after i made a blunder in najdorf. Time control: 2 hours

alcor wrote:

I was white and i tried to defend after i made a blunder in najdorf. Time control: 2 hours

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I share info. using the Socratic Method (answer a question with a question) This encourages the receiver of info. to think for herself/himself.  The ownership of original ideas is very important to most human beings.  Even after they discover that their original idea is a very ingenious way to reinvent the wheel.

After Black's 6...Nbd7 (although this is playable Black has to play the opening very accurately to avoid many tactical problems.  He also has a positionally inferior middlegame.)

The best response to 6...Nbd7 is 7.Bc4  (I know why.  Could you please tell me why you think it is or is not  the best response.)

Your game continued 7.Bd3!? (in your notes you write, "i forgot lines and therefore made a mistake) I know why 7.Bd3!? is dubious.  Could you please tell me the reason(s) why you consider 7.Bd3 dubious.

After 7...Qc7 in your game, the better move is 8.f4.  You played 8.0-0!?

I know why 8.0-0!? is dubious.Please tell me your reason(s) why you understand  8.0-0!? is dubious.

 A likely continuation of the game after 8.f4 is 8...e6 9.Qf3 b5 10.0-0-0 Bb7 (10...b4?! 11.Nd5!) 11.Rhe1 Qb6 12.Nd5 Qxd4 13.Bxf6 gxf6 14.Bxb5 Qc5 15.b4 Qxb5 16.Nc7+ ( this line beginning with 9.Qf3 is the most aggressive and threatening line that White has against the defensive move order Black has chosen.)