Seeing the Algorithm in Action
There are a couple of computer apps/mobile apps where you can see this algorithm in action.
One good app I would suggest is Graphs in Google Play store. I will write about it in length some other day.
Another app, very powerful for analysis of graphs in computers is GraphTea, a free software available for download on Linux/Windows/Mac OS. Download it here. Draw your graph, click on the Algorithms menu and pick Dijkstra’s algorithm.
Here’s a list of other apps you can use on your system, most of them are free and open source: AlternativeTo GraphTea.