Okay, so I'm just getting started with Minecraft modding, but have some prior Java experience. Anyways, I have a problem that I can't find anyone else that have, so I'm most likely very stupid...
The problem is the error you see in the title, The import net cannot be resolved.
Example:
import net.minecraftforge.fml.common.Mod; // Eclipse makes a red line under "net" and gives the previously named error.
Eclipse do find things like GradleStart though.