Amit Patels site made A* finally click for me. I’ve implemented breadth first search before and it was a nice moment when I realised that Dijkstra’s is a minor

Amit Patels site made A* finally click for me. I’ve implemented breadth first search before and it was a nice moment when I realised that Dijkstra’s is a minor change to BFS and A* is just a one line change (plus the heuristic function) to Dijkstas’s. Very well written with nice interactive illustrations.