A. Setup
Setting up Linux for 61B is super easy, all you have to do is use your package manager (apt-get, yum, etc) to install the Java 9 JDK, python3, and git.
Installing Java with apt-get is a little weird (see this post):
sudo apt-get -o Dpkg::Options::="--force-overwrite" install openjdk-9-jdk
To install python3:
sudo apt-get install python3
To install git:
sudo apt-get install git
By contrast, look at what those poor folks using Windows have to do!