Sufna 2020 Punjabi 720p Webdlmkv Filmyflycom Work Guide

I need to explain what Web-DL is, the significance of MKV as a container, and codecs involved. They might be new to this, so I should avoid too much technical jargon. Also, mention that downloading from FilmyFly could be piracy, so I have to be careful not to encourage that. Suggest legal sources instead.