How do I setup a Minecraft Forge development environment?

I want to start creating awesome Minecraft mods, and it seems that the current way to do so is with Minecraft Forge. I already got Gradle and the JDK installed, but no matter what I do I can't seem to get anything to build.

How can I get a Forge development environment working?

Copyright Notice：Content Author:「SoniEx2」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/39153347/how-do-i-setup-a-minecraft-forge-development-environment

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