Git should be part of your main workflow when working on projects. A good branching model should be part of that as well. However, switching branches is not always auto-completed using the tab key. For this, you can find a script which fixes auto completion for you.
Here’s the bash script you can run to get auto-completion:
#!/usr/bin/env bash
curl https://raw.githubusercontent.com/git/git/master/contrib/completion/git-completion.bash -o ~/.git-completion.bash
echo "if [ -f ~/.git-completion.bash ]; then
. ~/.git-completion.bash
fi
source /etc/bash_completion.d/git-prompt
source /etc/bash_completion.d/git-flow" >> ~/.bashrc
source ~/.bashrc