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.
I used the textbook as the primary reference but I tried some of the games posted here and they helped me learn a nuance or two that I missed while reading the book