Here's a quick how to. Do it exactly as seen. Do not try to write by hand, just copy to terminal and press enter.
I am expecting anything you see in those boxed to be copied directly into terminal.
###Your operating system
####UNIX
#####Mac I am assuming you are using either Mountain Lion or Lion. You can check by Apple icon (top left) > About this mac. ML is 10.8, Lion, 10.7, Snow Leopard 10.6. If you're using Snow Leopard, buy Mountain Lion from the Mac App Store ($20), it'll take care of itself.
#####Linux
You probably don't need my help, but just in case:
sudo apt-get install git
####Windows
The least insane way to get git working on a Windows PC is installing Linux on it. You can do that by either doing a proper virtual machine setup, or by installing apps (including git for Windows, unsupported) that do it for you. Here's the official github app, but it's only for Windows 8 and looks a little bit crippled. It's essentially running a linux kernel on VM to give you bash, git and else.
###Here's the stuff you need to do
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Install this: for Mountain Lion and for Lion.
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Fire up the terminal (Command + Space, write terminal, enter)
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Paste + Enter:
ruby -e "$(curl -fsSL https://raw.github.com/mxcl/homebrew/go)"
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Paste + Enter:
brew doctor
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Paste + Enter:
brew install git
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That's it!
###Want to also clone the repo?
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Paste + Enter:
cd ~/Desktop
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Paste + Enter:
git clone https://github.com/yyx990803/creative-html5.git
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If asks for username / password, enter, if not, register at github, then enter.
######You should now have a directory called creative-html5 in your desktop.
Good luck!