Google-searching, "Parkour", can often result in finding a lot of reckless, or ego-driven nonsense. However, there are many, many practitioners out there who strive to share informative, useful and responsible content that can help a novice practitioner grow in healthy directions with the discipline.
Below are links to other resources we endorse for your journey into parkour.
Most accurate account of the history of parkour, from Parkour Generations: http://parkourgenerations.com/parkour-history/
Solving a Problem- Parkour Training and Conditioning by Ryan Ford: https://www.youtube.com/watch?v=to6SGjaovSo
Parkour Training: SPRC by Adam McClellan and Andy Keller: https://www.youtube.com/watch?v=VMZuwOUTtJg
Parkour: The Nature of Challenge by Northern Parkour: https://www.youtube.com/watch?v=Poph6Jmc688
The Parkour Road Map by Max Henry: http://www.parkourroadmap.com/