I have a stockpile of Dragon Souls that are waiting to be leeched into a shout.
Can you learn all three parts of all the Shouts?
I'd hate to get a useful shout later in the game just to find out I've used all my slots up.
I play on an XBox, and am on my 6th char, and have yet to find/get ALL of the Shouts. For one, Arcwind Point is the stopper. Once Arngier gives that location, then it's done, nothing more, as Arcwind Point never leaves the quest log.
I've also made many, many attempts to just get them on my own, without Arngier. No joy there either, as the Word Wall's remain silent. And I've got 2-dozen Soul's just waiting, and nothing from Arngier. No "letter from a friend", nothing.
Bethesda knew of this problem way last Spring of 2012 and did nothing. And old Parthrunax is also still alive, so that's not the problem.
If there is a way to get ALL of the Word's via XBox, I've yet to find out how.
As far as "main" shout's? For me, Dragonrend, Disarm and Unrelenting Force are the one's I mostly use. I used Soul Tear a lot with my other char's, but cannot even get the first Word of that.