git clone folder | sub-directory | partial checkout | Simplest way

This is about git clone for only specific folder, we also call it Partial checkout. It is useful when repo is very big like many GBs & taking clone might take many hours. In a situation where we need or require only few folders, we are forced to do full clone eventually takes toll on time. So, here we have a way where we can do the partial checkout & save your precious time, and invest in real development.