Here you can find a customized map of Cyrodiil ( click here for a lower zoom level), the world of Oblivion (it's in black&white for contrast reasons, in case you wonder), with all the main locations marked on the map. In particular, it's advisable to save the game before starting every quest, and it's also a good idea to make backups every 10 completed quests or so - you never know. Although the game-breaking glitches are rare, to be safe it's always a good idea to save the game on different slots every now and then, so in case something bad happens you have a nice backup ready to be used.
There are many, countless small bugs that may trigger, sometimes creating funny situations, sometimes preventing you from continuing quests (even main storyline quests) with all the nuisance associated to this. Daedric Artifact: Azura's Star and Wabbajackĭue to its giant world, it's natural to encounter glitches and bugs in Oblivion. Altar of Enchantment: Custom Spells, Soul Gems and Enchanted Equipment Altars in chapels, Wayshrines and Vampirism
Taking Care of Your Gear (about repairing equipment)