Anything in [ ] is place holder text. Run an ls command to see what folders and files are present in your current directory. Run pwd to see your current path (where you are in the folder structure). Once you know where you are where you want to go you can use CD accordingly. That make sense?
explorer . - will open current folder in Windows so you can see your folders in a non text way (Mac and Linux you probably have something similar)
up and down arrows - will go to previous or next command that you have entered
[command] [part of filename] [press tab] - hitting tab after typing part of a filename will autofill the rest of the filename for you. Helpful if you have long filenames and/or many similarly named files