LECTURE 18 OF 25
Graphs
Most 'graph problems' aren't handed to you as a graph at all — a grid, a word list, or a set of game states IS a graph the moment you decide what a 'node' and an 'edge' mean.
Builds on
Best read after 5. Recursion, 8. Linked Lists, 9. Stacks and Queues — you can still read ahead, but some of this may lean on ideas covered there.