How to work on a task:

create a new branch

>git checkout -b branch_name

or switch to existing branch

>git checkout branch_name

make your changes.....

add your changes to local repo

>git add path_to_file_or_folder (. for current)

commit your changes to local repo, message is required

>git commit -m "commit message"

push your changes to remote repo

>git push origin branch_name

go to github to your branch and open PR (pull request)

after at least one +1 you can merge your PR to upstream

How to update master:

>git checkout master

>git pull upstream master

>git push origin master

>git checkout branch_name

>git rebase master