update copy

Author: cassgvp

docs/tut/1-1-command-line.md

@@ -22,7 +22,7 @@ Using the command line requires you to pay close attention to spacing and case (
 
 We will be using the command line to install some programs, and communicate with our online repository which holds our documentation.
 
-## How to access you command online
+## How to access your command online
 
 We will be using a unix based command line, as this is consistently available across unix/linux systems (for example high performance computing clusters), Mac OS and Windows OS.
 
@@ -36,7 +36,7 @@ From Windows 10 onwards you can access a unix command line using the application
 
 ## Basic command line tutorial
 
-Launch your command line application and have a go at completing [Unix Tutorial 1 from the University of Surrey](http://www.ee.surrey.ac.uk/Teaching/Unix/unix1.html). [Tutorial 2 (up to rmdir)](http://www.ee.surrey.ac.uk/Teaching/Unix/unix2.html) will also be helpful.
+Launch your command line application and have a go at completing [Unix Tutorial 1 from the University of Surrey](http://www.ee.surrey.ac.uk/Teaching/Unix/unix1.html). [Tutorial 2 (up to rmdir)](http://www.ee.surrey.ac.uk/Teaching/Unix/unix2.html) will also be helpful for what we're aiming to achieve.
 
 After you have completed these tutorials, you should be able to do this via command line:
 

docs/tut/2-1-install-git.md

@@ -11,7 +11,13 @@ has_children: false
 # Install git
 {: .fs-8 }
 
-Make your github account
+Install git on your computer
 {: .fs-6 .fw-300 }
 
 ---
+
+Git is a system for tracking and recording changes to files. More concretely, git takes a "snapshot" of your files every time you "commit" them to your repository. If the files have not changed, git stores a link to the previous snapshot rather than recording a new one. This is a system of version control. Importantly allows you to keep a very explicit record of what has changed , and when, and revert to earlier versions if necessary.
+
+Git was developed to allow distributed teams to work on vast repositories of code simultaneously without stepping on each others toes. The code is held in one central repository, and others are invite to access it (or "contribute" to it) from wherever they are. Imagine trying to write and test a computer program by emailing round a document with track changes?! Wouldn't be pretty.
+
+Some computers come with git pre-installed. On others you will need to install it yourself. Follow these instructions to [install git on your computer](https://github.com/git-guides/install-git).

docs/tut/2-2-configure-git.md

@@ -0,0 +1,34 @@
+---
+layout: default
+title: 2.2 Configure git
+nav_order: 2
+grand_parent: Tutorials
+parent: 2. Starting with GitHub
+has_children: false
+---
+
+
+# Configure git
+{: .fs-8 }
+
+Configure git on your system (one time only)
+{: .fs-6 .fw-300 }
+
+---
+
+Now you have git installed, you need to set a few variables so git knows who you are and who is making changes to your documentation!
+
+Open your command line application and enter the below, one line at a time (press return after each line). replace "Your Name" with your actual name...
+
+```
+git config --global user.name "Your Name"
+git config --global user.email your-email-address@example.com
+git config --global core.editor=atom --wait
+
+```
+
+You can then list the contents of your git config file using the command below, and check the above variables have been stored.
+
+```
+git config --list
+```