huawei@DESKTOP-JTC012C MINGW64 ~/Desktop/git-repo (master) 
$ ls 
hello 
huawei@DESKTOP-JTC012C MINGW64 ~/Desktop/git-repo (master) 
$ ls -a 
./ ../ .git/ hello 
huawei@DESKTOP-JTC012C MINGW64 ~/Desktop/git-repo (master) 
$ rm -rf .git/ hello 
huawei@DESKTOP-JTC012C MINGW64 ~/Desktop/git-repo 
$ git init 
Initialized empty Git repository in C:/Users/huawei/Desktop/git-repo/.git/ 

huawei@DESKTOP-JTC012C MINGW64 ~/Desktop/git-repo (master) 
$ echo "hello world" > hello 
huawei@DESKTOP-JTC012C MINGW64 ~/Desktop/git-repo (master) 
$ git status 
On branch master 
No commits yet 
Untracked files: 
 (use "git add <file>..." to include in what will be committed) 
  hello 
nothing added to commit but untracked files present (use "git add" to track) 

huawei@DESKTOP-JTC012C MINGW64 ~/Desktop/git-repo (master) 
$ git status 
On branch master 
nothing to commit, working tree clean 
huawei@DESKTOP-JTC012C MINGW64 ~/Desktop/git-repo (master) 
$ echo "a" > a 
huawei@DESKTOP-JTC012C MINGW64 ~/Desktop/git-repo (master) 
$ git status 
On branch master 
Untracked files: 
 (use "git add <file>..." to include in what will be committed) 
  a 
nothing added to commit but untracked files present (use "git add" to track) 
huawei@DESKTOP-JTC012C MINGW64 ~/Desktop/git-repo (master) 
$ echo a  .gitignore 
huawei@DESKTOP-JTC012C MINGW64 ~/Desktop/git-repo (master) 
$ git status 
On branch master 
Untracked files: 
 (use "git add <file>..." to include in what will be committed) 
  .gitignore 
nothing added to commit but untracked files present (use "git add" to track)