git replacing LF with CRLF

First question arrives, Why does this warning message occur in the first place?

It can be due to Incorrect default value of core.autocrlf on Windows.

• Now let us discuss the meaning of two types of warning messages,
  
• First warning message is 'LF will be replaced by CRLF', this warning message says that you will lose your unix-style LF (Having autocrlf=true) after the commit-checkout cycle and it will be replaced by windows-style CRLF. Note that Git doesn't expect you to use unix-style LF under windows.
  
• Second warning message is 'CRLF will be replaced by LF', this warning message says that you will lose your windows-style CRLF (having autocrlf=input) after performing a commit-checkout cycle and it will be replaced by unix-style LF. Note that you should not use input under windows.
  

Now let us see how can we resolve this issue:

During the installation process of Git itself the default value for core.autocrlf is selected.

Which is stored in system-wide gitconfig (%ProgramFiles(x86)%gitetcgitconfig).

• Also there:
  
•    'global' (per-user) gitconfig located at ~/.gitconfig, yet another
  
•    'global' (per-user) gitconfig at $XDG_CONFIG_HOME/git/config or $HOME/.config/git/config and
  
•    'local' (per-repo) gitconfig at .git/config in the working dir.
  

All you want to do is write git config core.autocrlf in the working dir to check the currently used value.

•    add autocrlf=false to system-wide gitconfig
  
•    git config --global core.autocrlf false
  
•    git config --local core.autocrlf false
  

So for Windows:

    Keep the core.autocrlf = true if you plan to use this project under Unix as well (and unwilling to configure your editor/IDE to use unix line endings),

    Keep the core.autocrlf = false if you plan to use this project under Windows only (or you have configured your editor/IDE to use Windows line endings),

    But *remember* keep the core.autocrlf = input only you have a good reason to (eg if you're using unix utilities under windows or if you run into makefiles issues)