Review this week's lecture presentation. What was the most difficult concept for you to understand? What additional resources on the topic have you been able to find by researching resources on the I

Review this week's lecture presentation. What was the most difficult concept for you to understand?  What additional resources on the topic have you been able to find by researching resources on the Internet (do not refer to/cite Wikipedia as a resource)? 

Make sure your response is APA compliant, provides a reference list that includes additional references identified, and incorporates in-text citations to those references.

Note:for lecture presentation i am attaching document. I need this assignment in two papers.