I'm going to read The Art of War, I had heard about this book before but I didn't want to read it because I thought that this book it was only for soldiers, businessmaen and businesswomen. I'm going to read The Art of War, I had heard about this book before but I didn't want to read it because I thought that this book was only for soldiers, businessmen and businesswomen.

businessmEn - plural "though" means despite "thought" is the past tense of think that you were looking for

I'm going to read The Art of War, I had've heard about this book before but I didn't want to read it because I tough that this book it was only for soldiers,helpful for members of the military, as well as businessmaen and businesswomen. I'm going to read The Art of War, I've heard about this book before but I didn't want to read it because I tough that this book was only helpful for members of the military, as well as businessmen and businesswomen.

I'm going to read The Art of War, I had heard about this book before but I didn't want to read it because I though that thise book it was only for soldiers, businessman and businesswomen. I'm going to read The Art of War, I heard about this book before but I didn't want to read it because I thought the book was only for soldiers, businessman and businesswomen.

I'm going to read The Art of War,. I had heard about this book before but I didn't want to read it because I thought that this book it was only for soldiers, businessman and businesswomen. I'm going to read The Art of War. I had heard about this book before but I didn't want to read it because I thought that this book was only for soldiers, businessman and businesswomen.

I'm going to read ‘The Art of War,’. I had first heard about this book beforea bit ago but I didn't want to read it because I thought that this book it was only for soldiers, businessmaen and businesswomen. I'm going to read ‘The Art of War’. I had first heard about this book a bit ago but I didn't want to read it because I thought that it was only for soldiers, businessmen and businesswomen.

- the use of apostrophes makes it more clear that it is a book

However, I watched a video about a boy who overcame his addiction to social media addiction using some concepts of this book. However, I watched a video about a boy who overcame his social media addiction using some concepts of this book.

More common to say "(addictive substance) addiction" Yours work too!

However, I watched a video about a boy who overcame his addiction to social media using some of the concepts ofrom this book. However, I watched a video about a boy who overcame his addiction to social media using some of the concepts from this book.

However I watched a video about a boy, however, who overcame his addiction to social media using some concepts ofdescribed in this book. I watched a video about a boy, however, who overcame his addiction to social media using some concepts described in this book.

However I watched a video about a boy who overcame his addiction to social media using some concepts ofrom this book. However I watched a video about a boy who overcame his addiction to social media using some concepts from this book.

I also watched a video about another girl who also used the concepts of this book, but for achieving good grades in exams, instead. I also watched a video about another girl who used the concepts of this book, but for achieving good grades in exams, instead.

You won't want to repeat "also" twice, so consider using "another"

I also watched a video about a girl who also usapplied the concepts of this book, but in her case for achieving good grades ion exams, instead. I also watched a video about a girl who also applied the concepts of this book, but in her case for achieving good grades on exams.

I also watched a video about a girl who also used the concepts of this book, but forto achievinge good grades in exams, instead. I also watched a video about a girl who also used the concepts of this book, to achieve good grades in exams.

I also watched a video about a girl who also used the concepts ofdescribed in this book, but for achieving good grades in exams, instead. I also watched a video about a girl who also used the concepts described in this book, but for achieving good grades in exams instead.

I also watched a video about a girl who also used the concepts of this book, but forto instead achievinge good grades in her exams, instead. I also watched a video about a girl who also used the concepts of this book, but to instead achieve good grades in her exams.

Word order is more natural like this !

I'm going to read it and maybe I could'll be able to use some concepts for my own purposes. I'm going to read it and maybe I'll be able to use some concepts for my own purposes.

I'm going to read it and maybe I couldan use some concepts for my own purposes. I'm going to read it and maybe I can use some concepts for my own purposes.

I'm going to read it and maybe I couldwill be able to use some of the concepts for my own purposes. I'm going to read it and maybe I will be able to use some of the concepts for my own purposes.