A little bit of help with git

[Frameworks]

Hi,

I am in a muddle with git and how is the best way to suggest and commit 
changes. Can anyone help me with a minimalist crash course? Lets say 
that I want to collaborate with Android QT Creator. So what I did was:

1. Create an account and clone /android-qt-creator/ into my account in 
what is called now /qlandss-android-qt-creator/
2. I can see that my clone also has branches like stable, testing, etc.
3. I created a repositories directory in my linux and executed /git 
clone git://gitorious.org/~qlands/qt-creator/qlandss-android-qt-creator.git/


Now comes the questions:

1. What do I need to do now so I can start applying changes in the 
testing branch?
2. Having point 1 resolved and I did some changes in the code, what do I 
need to do to commit them to the remote repository?
3. I guess when I have tested the changes I can ask for a merge. Is this 
correct?
3. What other issues do I need to consider?

Many thanks,
Carlos.

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