Once you're done with the tutorial bit, the https://learngitbranching.js.org/?NODEMO version is good to try out commands and see what the tree looks like after each command.
Yeah! This is a great tool and it's been around for a while. Nice little puzzles and good to have some kind of visual representation. But Devlands can do so much more than visualize the commit graph: https://www.youtube.com/watch?v=BF7FnK1Gml8
Once you're done with the tutorial bit, the https://learngitbranching.js.org/?NODEMO version is good to try out commands and see what the tree looks like after each command.