The Raspberry PI organization hosts [RASPBIAN] which comes pre-installed with plenty of software for education, programming and general use. It has Python, Scratch, Sonic Pi, Java, Mathematica and more. [Noobs] is a tool that can flash an SD card to install Raspbian. The SD card organization has a [SD Card Formatter] tool to format the SD card.
Reminder: On RPI2 with Raspbian, the default user is pi with the password raspberry.