Focus on the structures, leave the algorithms for later. Seek out and study the papers, and build each data structure one by one. You'll know you understand it when you can build it, when you can see its structure. There's a master key hidden embedded within the structures too. Pieces of the key are distributed among them, waiting for its fragments to be connected. Its secrets revealed and retrieved by a select few. One of the secrets you'll discover on this quest is this: Once you get the structures, you get the algorithms for free.

See https://news.ycombinator.com/item?id=20047607