I just started getting interested in lore. I have been playing TES since Marrowind. I hadnt really been paying close attention to the lore, until just recently.
Im curious to know if all the lore is documented in the (in game books). Can I learn everything about the lore by reading through the imperial library? Or is there some information about lore, that you can only get through playing the games?
In other words, do I have to buy Arena, Daggerfall ,Battlespire and Redguard? Then play them all through a million times?
You don't need to play those games, but you should at least watch a let's play of redguard. It's quite memorable. For Arena, Daggerfall, and Battlespire, TiL has extensive plot summaries that should give you a clear idea of what happened in each game. (the later games don't give you enough info to peice together all the happenings of it's predecessors)
Also, Arena and Daggerfall are now free and publically available for download.