Synchronize forked repository with new commits to original repository

To synchronize with your forked repository with the new updated content of the original repository follow these 5 steps:

Step 1
Check whether that you have configured a remote to original repository
git remote -v  command will list remote URLs as follows

If you haven't configured remote to original repository, you will see only origin (which is forked your repository) in the list. 

Step 2
configure a remote pointing original repository with following command

git remote add <remote_name> <url>

Generally we use name "upstream"

then list down remotes and check whether upstream is in the list

Step 3

Now download content from the original repository using fetch command

git fetch <remote>

This will fetch all the branches and commits from the original repository (if <remote> is pointing to it), in this case upstream

Step 4

Check out your local master branch by git checkout master command. 

At this point you have to commit if you have done any changes to local repository.

Step 5

Now merge changes from upstream master to local master by following command

git merge upstream/master

you will see similar to following

Now you local repository is updated with original repository's new content.

Then you can push new updates to your remote repository

Cheers ....