.gitignore is the git config file where we can declare files and folder to exclude from git commits, such as log files, build files and system generated files. There is a set of certain files which we may need to exclude from the every project and it is a tedious task to add those files in .gitignore manually for each project. To avoid this we can create a global .gitignore file.

Create a .gitignore file in the home directory

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touch .gitignore

And then declare the global .gitignore

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git config --global core.excludesfile ~/.gitignore

Here is the example of my global .gitignore.