The key concepts are: Basics of Key Exchange; Diffie-Hellman, Diffie-Hellman Weaknesses, ECDH, and Passing Key Using Public Key. What you should know at the end of unit?

Understand how the Diffie-Hellman process works, with a simple example
Understands how the private key is used to check the identity of the sender, and how public key is used to preserve the privacy of the message.
Understand the basics of how Bob and Alice generate a shared key with ECC.

Presentations

Week 5 Presentation (lecture - Part 1) - Key Exchange: here
Week 5 Presentation (lecture - Part 2) - Key Exchange: here
Week 5 Presentation (PDF) - Key Exchange: here

Examples

Diffie-Hellman Examples: here
ECDH Step-by-step: here

Quick demos

Introduction to Diffie-Hellman: here
ECDH here
Picking the Generator Value (G): here