In this video, I have talked about LetsEncrypt, for questions like: "What is it?" and "How to use it?". To give a better understanding to new in this field, I have discussed HTTPS and SSL certificates briefly in the beginning of the video. Yes - about 25 minutes is brief! - considering the importance of the topic! :)
For ease of understanding, I have used a simple/single Apache web server to show how HTTP-01 and DNS-01 challenges work.
The related github repository is here: https://github.com/KamranAzeem/learn-...
Related presentation is here: https://docs.google.com/presentation/...