I don't understand what's so difficult about installing Forge that people need a video.
Just have Java installed properly and double click the installer.
When you say "it made me" does that mean you got the installer and IT uninstalled the other Java versions?
Edit: Also, what's up with the morse code looking stuff?
It's recommended that you use the Gradle Wrapper that the MDK comes with.
Besides that, where are you expecting Gradle to pull junit from? Nevermind, I guess that's provided by useJUnitPlatform()
Just as a heads up, Twitch does not use Forge's file server, they rehost everything and are known to have problems sometimes.
Their client also messes with some launch settings and prevent Forge from creating debug.log