Best tutorial EVER!!!

0. Select folder:
cd ..     -- to go up
cd Mr.Green-MTA-Resources -- to go into folder

1.

git remote add upstream https://github.com/JarnoVgr/Mr.Green-MTA-Resources.git

2.

git fetch upstream

3.

git checkout master

4.

git rebase upstream/master

5.

git push -f origin master

P.S. best tutorial for MAD by AleksCore 2k16 using Mads pc and help