The Windows tutorial you've got is for the Windows 10 version of the game, while you'll probably want to look at a tutorial for the Java edition of the game, as that's what you were most likely playing (and what the tutorial you have is for) on Mac.
A quick rundown is, after installing Minecraft:
1- Press the Windows Key and R at the same time
2-Type %appdata% and enter
3- Open the .minecraft folder
4- Put your save in the saves folder.