The book is the Oghma Infinium. You need access to a bookshelf.
First you 'use' the bookshelf.
While in the inventory screen, read the book and choose the skill path you wish to increase. Close the book, but do not exit the inventory screen, you need to place the book on the shelf before exiting.
The book is now on the shelf, and did not disappear.
Click on the book and remove it without reading it.
Repeat the process.
There are only 81 levels in Skyrim.
No, Level 81 is the highest that player characters can ascend to.
You can reach level 81 in Skyrim I think but that will take an awful long time, and to be honest, who would be bothered.
81 so far, hopefully there will be a patch release for the levels after 81 soon.
No, after everything is level 100 you will be level 81 and you will not be able to level up anymore
There is a hard cap of Level 81. This is determined by people using a cheat to put all their skills to 100 and seeing what level they become. When all skills are 100, there's no way to level further, so 81 is the cap.
He's level 81, as he's already beaten and mastered the game more than once, and on many occasions.
81 because that is the highest level and you only get 1 perk point per level
level 81. EDIT: The Patch 1.9 has been released on PC, which allows the player to 'Legendary' their skills, i.e. reset them to level 1, so there is no highest level now, at least on PC.
Level 81 impossible challenge
Yes and No. The game is based on a level system. There is said to be an unlimited number of quests. If you get to around level 81-82, you stop leveling up. If by beat, you mean finish the main story line then yes. If by finishing the game beyond playability, then no.
He is level 81.