The Force Awakens novelization

Episode VII: The Force Awakens novelization by Alan Dean Foster
The official book version of the Star Wars: The Force Awakens movie, set three decades after Return of the Jedi and written by the same author as the first Star Wars book ever!

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This is a book from the New Canon timeline! It's guaranteed to be consistent with future movies, TV shows, books, and comics (and all new stories since mid-2014).

The Approaching Storm

The Approaching Storm by Alan Dean Foster
A lead-in novel taking place just before the Episode II: Attack of the Clones movie, focused on showing the relationship between Obi-Wan Kenobi and his now-adult Padawan Anakin Skywalker during their mission on a remote planet. Jedi Master Luminara Unduli and Padawan Barriss Offee also play major roles in the story.

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This is a prequel era book from the Legends timeline. It may be contradicted by newer books, movies, or TV shows (if so, just think of it as an alternate universe).

Star Wars Episode IV: A New Hope novelization

Star Wars Episode IV: A New Hope novelization by George Lucas 
The very first Star Wars book ever, this novel was written by Alan Dean Foster based on George Lucas's script for the original Star Wars movie (Foster agreed to do it without credit). It was released in 1976, six months before the movie, and was then titled Star Wars: From the Adventures of Luke Skywalker.

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This is a movie novelization from the Legends timeline. Though the movie itself is canon, original content in the book could be contradicted by future books, movies, or TV shows (if so, you can think of it as an alternate universe).

Splinter of the Mind's Eye

Splinter of the Mind's Eye by Alan Dean Foster
The first ever Star Wars expanded universe novel, released in 1978, this book was written under the requirement that it could be made into a cheap sequel to the first Star Wars film in case the movie didn't do well enough to justify a big-budget follow-up. It tells the story of Luke and Leia crash-landing on a swamp planet, where they must keep a powerful Force-magnifying crystal from falling into the hands of the Empire. Before the end, they'll have to face the Empire's most feared villain: Darth Vader.

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This is a classic era book from the Legends timeline. It will likely be contradicted by newer books (if so, just think of it as an alternate universe).