Youre english is not bad henry89
I have not read that book, but maybe somebody else here has?
Either way, I think that the best way to do well in poker is to always keep a record of youre own playing.
Where you played,at wich table(buyin), How many players participated(if tourney), at wich time of the day you played....such stuff....
Then you can see where you make mistakes and can do better.
So do read several books but always keep record of youre own play.