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Installing ROS on Pi 3 is straightforward. Your best bet is to keep things as plain vanilla as possible, meaning use the correct version of Ubuntu to match the ROS release you are targeting. If you start with the appropriate version of Ubuntu installed onto your Pi 3, then you can simply follow the standard ROS install instructions and they will work!
http://wiki.ros.org/kinetic/Installation/Ubuntu
For ROS Kinetic, you'll want to target the Ubuntu 16.04 (Xenial) release. For other versions of ROS, check the page:
http://wiki.ros.org/Distributions
Keeping things vanilla means you'll get the most stable configuration, as it's the one many others are using, albeit on different hardwares.
For Ubuntu install:
https://ubuntu.com/download/raspberry-pi
Keep in mind that unless you have a specific reason for targeting Kinetic, you might prefer to use a newer version of ROS/Ubuntu, like Melodic/18.04.
Finally, you could find lots of interesting ROS/Pi related info at https://rhoeby.com.