I am struggling with my lesson. I have no professor to help me wade through. It's learning how to begin with Git.

https://www.theodinproject.com/lessons/foundations-git-basics this is the lesson that i am following. I completed the Create the Repository section successfully. I also completed the Use the Git Workflow section successfully. It's the Modify a File or two where I am facing all the difficulties.

Can someone please show me the way how to do it ?