Examples for p5.ble.js, read more at p5 ble website.
Change directory into the examples folder and start a server.
An easy way to start a server is with python.
If you are have python 2:
cd examples
python -m SimpleHTTPServer
If you are have python 3:
cd examples
python -m http.server
Go to localhost:8000 and click through each example
If you don't know how to start a server, check this guide.