gistfile1.txt

Say your code resides in a dir called project/ locally and you want to push it up to an empty repo on github. Then, if your repo is called, say, foo, get its URL, e.g., https://github.com/sneha/foo.git and do
 
    git remote add origin https://github.com/sneha/foo.git
 
from your project/ dir. After that, add files using `git add`. Use the followinng for all files:
 
    git add .
 
Then commit changes

    git commit -m "initial commit"
 
Now do
 
    git push origin master
 
assuming you have just a single branch master. Otherwise, just replace master with whatever branch you want to push to.
After this when you make changes, add those files using `git add file1 file2...`, commit and push.
Another scenario is that you created the repo first and cloned it and added files and now want to push. If this is the case, skip the first step of adding a remote - just add what you want, commit and push.