These are the books in Sanderson's ongoing Stormlight Archive:
The Way of Kings (383,389 words)
Words of Radiance (399,431 words)
Oathbringer (451,912 words)
Rhythm of War (451,912 words)
He's also written the Mistborn series (8 books), Elantris, the Emperor's Soul, the Reckoners series, the Skyward series, and finished writing the Wheel of Time series after Robert Jordan's passing. And that's just what I can remember off the top of my head.
His first novel to be published was (I believe) over his tenth to be written. He started the ongoing Writing Excuses series with two other people in 2008, and having listened to several seasons myself (my sister has listened to all fourteen) I can second the recommendation--they touch on many different useful techniques, especially regarding worldbuilding, and offer a lot of very good advice about them, much of which I had been forced to figure out on my own before finding that podcast. The hosts acknowledge many times throughout their podcast that pretty much every writing rule imaginable can be broken under the right circumstances. It's very much more a picture of how they write than how anybody else has to write.
Sanderson's definitely written a lot. I believe he knows what he's talking about. Sure, there are several things I disagree with him about, and he's admitted himself that he still finds it difficult sometimes to write humor, but he's absolutely a skilled writer and his professional output is incredible. I would consider him one of this era's writing masters.
His best strengths are in solid climaxes, cool, consistent magic systems, detailed world-building, and disciplined writing habits. For me, characterization is where he sometimes falls short, but I'd say there's very little else.
