Well, there are forge's docs which are not a tutorial but are still useful to read when you are having issues
https://mcforge.readthedocs.io/en/latest/
In addition there are some modding examples here and there, like @Cadiboo's example mod
Also feel free to ask here of course if you are having an issue you can't resolve or something.
yeah he should try running it without sudo .. as far as i know if it used with superuser rights it will write the files for superusers ... sooo eclipse can't open it because it would need superuser rights
also if you do that delete the already written files before hand .. it might cause issues !
Did you try running it without sudo? I don't know if you need, or would really even want, to run that as root, as 1) security, and 2) the files will be setup for use by the root user, not your user user.
This is a guess, as I currently am not running a linux workstation so can't verify any of it.