The Elder Scrolls V: Skyrim Tips

Getting Oghma Infinium
To get this item (used for a level loop), you'll need to be level 15 or higher, and travel north from Winterhold to an extremely Northern cave called Septimus Signus's Outpost. After some talking, he'll give you a quet to go to Blackreach to transcribe the blank lexicon. Doing this will get you an Elder Scroll, which is basically a 20 pound weight that you can't get rid of and a Runed Lexicon. Go back to Signus and take his next quest to kill five different races (1 Orc, 1 High Elf, 1 Dark Elf, 1 Wood Elf, 1 Falmer). After you kill the people and get their blood (after killing them, just click to loot them). Go back to Signus, and he'll show you a sad cutscene, after which you'll be right in front of Oghma Infinium.

It'll take about 3-4 hours to do the whole quest without the loop if you choose to do it.