The tutorial is just using the terminal to launch Godot, presumably so Godot's output is displayed on the terminal. The reason the name is different is because they are using a version of Godot built form source, rather than one of the officially pre-built releases.
If you know where your Godot executable is on your computer, you can use the following command in the terminal to launch it (replace "path here" with the path to the executable")
cd "path here"
./Godot_v3.2.1-stable_win64.exe
cd is to change the directory of the terminal, basically telling the terminal to go to the path you have given it. the ./Godot... tells the terminal to launch Godot. This will launch Godot like normal, but the output from Godot will be displayed on the terminal, even after you have selected a project from the project manager.
If you do not want/need the terminal to output the log, you can just run Godot by double clicking the executable, which will launch Godot on most operating systems.
