What lead to Agile Software Development: https://youtu.be/mBfqp14Tnjs

The Agile Manifestos: http://agilemanifesto.org/principles.html

The Agile Manifesto – 4 Agile Values Explained: https://youtu.be/rf8Gi2RLKWQ

The Agile Manifesto – more details: https://youtu.be/WUsRL87KE00

Agile Principles: http://agilemanifesto.org/

12 Agile Principles explained: https://youtu.be/2DVf57axHv0

What is scrum:
https://youtu.be/TRcReyRYIMg

https://www.scrum.org/resources/what-is-scrum

https://www.scrumguides.org/scrum-guide.html