It probably means exactly what it says - open a browser and visit the site you're working with, while, at the same time, having a terminal window open so you can look at logs (probably - we don't know what you're doing, so we're not quite sure why you've been asked to do this)
The $ usually means a bash prompt, although other shells use it as the prompt too. Bash is a default shell on lot of Linux and Unix systems (the Mac uses it as well, and Atlassian are heavy Mac users, so that's probably where it came from). For Windows, just imagine it's your cmd prompt
Git as an unknown command means that either it's not installed, or it is not installed in the path. From memory (as I don't have a windows box to hand), try
It needs to include whereever you've installed git (although I thought installers included an amendment to the environment in it). You should be able to put it in the path in the environment settings.
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