the git add command

Hello there,

I recently made a change to a project, and for adding a file I changed 
to the staging area I used the command 'git add ookleuk/admin.py'. At 
this point I was logged into the parent directory of 'ookleuk' on the 
command line. However, when I used the push command, I got the response 
'everything up to date'. For now it isn't a problem, because when I used 
the command 'git add .' everything worked fine and the files in the 
repository got updated, but honestly, I want to be sure I'll be able to 
only upload specific files in the future.

A screenshot of the problem occurring on the command line is attached. 
Holler if you need more info.

Greetings, Isaac