Infinite skill level up glitch
Oghma Infinium that is in your inventory and not read is necessary for this glitch (obtained from the daedric quest 'Discerning the Transmundane'), as well as a book shelf (found in breezehome after getting the alchemy lab upgrade). Save before going further. Go to the book shelf and read the book, then select your skill set.Close the book but do not exit the bookshelf. Store the book into the bookshelf and then exit it. Take the book off the shelf and select the option (Do not read). Repeat the process until desired.