PMI has created a quick refresher course on Project kickoff.  Kickoff micro-course has two variants. Agile and Waterfall

Project kickoff micro course from PMI - Agile or Waterfall

It is a fun yet informative course with great graphics. 
I feel it is a great tool for beginners to start with Agile project management and expert to revise the concepts. For those who are preparing for the PMP 2021 exam, this small course can be a starting point for the Agile Journey.  

This micro-course is totally free from pmi.org. You will only need

to register on the PMI website.

Registration on PMI- https://idp.pmi.org/register
Kickoff Course landing page - https://www.perfectkickoff.com
For Kickoff micro-course - https://kickoff.pmi.org


Agile Kickoff micro-course has below chapters.

  1. Introduction
  2. Getting It Up And Running
  3. Set The Vision & Get Aligned
  4. Build Your Team
  5. Set Up Your Team Room
  6. Getting The Work Done
  7. Harness The Magic Of The Sprint
  8. Start Creating Your Backlog
  9. Create User Stories
  10. The Sprint Planning Meeting
  11. The Daily Scrum
  12. The Sprint Review
  13. The Retrospective
  14. Being Agile
  15. Measuring The Madness
  16. Release To Operations
  17. Finish Up & Celebrate

Waterfall Kickoff micro-course has below chapters.

  1. Introduction
  2. Getting It Up And Running
  3. Align People And Objectives
  4. Planning Your Project Work
  5. Know Your Stakeholders
  6. Get A Grip On Project Requirements
  7. Break Down The Work
  8. Sequence The Work
  9. Determine Who Does The Work
  10. Create The Project Schedule
  11. Know Your Risks & Create Mitigation Plans
  12. Review The Plan With Your Sponsors
  13. Getting The Work Done
  14. Project Kick-off
  15. Measure Project Success
  16. Keep Track & Stay In Control
  17. Stay Aligned With Key Stakeholders
  18. Closing Your Project
  19. Finish Up & Celebrate!

Select the course which you values the most of you. Both are equally great. I am using Agile practice in day to day life to I opt for the Agile micro-course variant.