Update chapter 2

02_getting_git/README.md

@@ -71,15 +71,42 @@ through the **command line**.
 ## Step 3. Clone this repository
 - Run ```cd C:/path/to/your/folder/``` to go to the parent folder for your project folder
   The following command will create the project folder for you.
-- Run ```git clone https://git.wur.nl/overb015/``` and see what happens.
+- Run ```git clone https://git.wur.nl/overb015/```
 
-## Step 4. Authenticate yourself
+## Step 4. Push your changes to the remote
+When you make changes to the contents of a repo, and you want to apply them to the project,
+you can **push** your changes to the remote.
+- Make a changes to the repo, such as adding a line to the README.md or creating a new file.
+- Open a terminal and go to the project directory.
+- Run ```git add .```; note the space and period at the end of the command
+  This command adds your changes to a new **commit** (a set of changes).
+  If you change more things after running this command, 
+  run it again to add the newly made changes too.
+- Run ```git commit -m "short description of the changes in this commit"```
+  The ```-m``` flag signals that you want to add a message to the commit.
+  The message is important when you want to find back these changes later on.
+- Run ```git push origin master``` to push **your** commits to **git.wur.nl**.
+  Here, **origin** refers to the remote at git.wur.nl 
+  and **master** refers to the branch on the remote that your changes apply to.
+- Read the response in the terminal. Were you allowed to change the master branch at git.wur.nl?
+
+## Step 5. Authenticate yourself
 In the previous step, you ran a command to download data from the Git repo at WUR,
 which is a secured environment.
 You need to authenticate yourself as a WUR user to access git.wur.nl from the terminal.
-
-> TODO: add steps for authentication by trying this with a new user.
+For Windows:
+- open the Start menu
+- type ```credential manager``` and hit Enter
+- next to **Generic Credentials**, click **Add a generic credential**
+- Address: ```git:https://git.wur.nl```
+- User name: your WUR e-mail address
+- Password: your WUR account password
+Now, close and restart the terminal and try **pushing** again.
 
 When you commit changes from your local repo to the remote,
 your identity is sent along with it.
 This is how everybody knows who did what in the project.
+
+## Step 5. Pulling changes from the remote
+Once you have your local copy in place, 
+