$ man thehack book-shop
Book Shop_
Books make you smarter, literally: every book you finish permanently raises your skills for the rest of the round.
Choosing a book
Books are grouped by subject: math, physics, networking, programming languages, social engineering and more. Open a subject to see its books.

For every book you see:
- Price: how much it costs.
- Reading time: how long it takes to finish it.
- Bonuses: how much it raises intelligence, technique, deceit and velocity.
- Restrictions (in red): the books you must have read first.
Reading
After buying a book, open your bookshelf with ./bookshelf -list and start reading. You read one book at a time and reading goes on even when you are offline: when it ends you get a notification and the bonuses are added to your skills.
Which skills matter
All four skills add to your attack power, but not equally: intelligence counts the most, then technique, deceit and finally velocity.
Tip: books take time, so start one as soon as you can and keep attacking while you read.
Next step: find out how to recover stamina at the Drug Dealer.