Did you miss the "Exploring LoRa with ARM Mbed" webinar? No worries. There's a recording of the webinar and many other resources to help you get started.
Start by watching the recording of the webinar here. It will provide with insights on what LoRa, how to use and why it is a part of Mbed: https://pages.arm.com/webinar-recording-exploring-lora-recording.html