Git Tutorial #11 - How to Ignore files/changes in Git?

A gitignore file specifies intentionally untracked files that Git should ignore. Files already tracked by Git are not affected.
Each line in a gitignore file specifies a pattern. When deciding whether to ignore a path, Git normally checks gitignore patterns from multiple sources, with the following order of precedence, from highest to lowest (within one level of precedence, the last matching pattern decides the outcome):