I haven’t actually used this site (found it after I already learnt Git), but it gets posted a lot, and one issue I feel like it has is it shows you the Git graph using a tool that you have to immediately throw away after you’ve finished this tutorial.
I think it would be better if it had an actual real Git tool shown. I would say VSCode’s Git Graph extension would be ideal but unfortunately it has a stupid license.
That, or git log --graph --pretty=oneline
(IDK why people seem to be willing to recommend using anything in order to learn git, with the exception of git itself)