I did 9 videos to demostrate Liferay DXP and I uploaded them on youtube:

Video 1: Introduction to Liferay DXP and the Demo
https://youtu.be/e3Vm36elwEY

Video 2: Liferay DXP Page & Content creation, Content Templates , localization, Workflow.
https://youtu.be/DWlikGcdQnw

Video 3: Liferay DXP Content permission, Asset publisher, Search
https://youtu.be/ykyX6d8f62A

Video 4: Liferay DXP Audience Targeting
https://youtu.be/yM6UvQnip4g

Video 5: Liferay DXP Staging
https://youtu.be/0uap-SwUl7c

Video 6: Liferay DXP Document Management
https://youtu.be/VFqlgyyNXFA

Video 7: Liferay DXP Blog, WIKI, Knowledge based
https://youtu.be/I0eQcQa2wTI

Video 8: Liferay DXP Forms and Integration.
https://youtu.be/wYP-fCDbERs

Video 9: Liferay DXP Collaboration and Intranet use case demo.
https://youtu.be/J3UBSMeQoj8