Actually it's very common for web-developers to ask these two questions:
1. Do these two methods work in the same way?
2. If I'm familiar with the way it works in SVN, can I use this method in the same way in Git?
The most important thing is that these two methods do not work in the same way.
If you want to add a file in SVN, it's enough to execute
svn add. Once it's done, the file changes will be committed one time only. In other words, each time you want to add a file to your repository, make sure to execute
In Git, however, once you run git add, the changes will be added each time you make a commit.