Git isn’t noticing the changes you made to your .gitignore file

If it seems like Git isn’t noticing the changes you made to your .gitignore file, you might want to check the following points:

• There might be a global .gitignore file that might interfere with your local one
• When you add something into a .gitignore file, try this:

git add [uncommitted changes you want to keep] && git commit
git rm -r --cached .
git add .
git commit -m "fixed untracked files"

• If you remove something from a .gitignore file, and the above steps maybe don’t work,if you found the above steps are not working, try this:

it add -f [files you want to track again]
git commit -m "Refresh removing files from .gitignore file."

// For example, if you want the .java type file to be tracked again,
// The command should be:
//     git add -f *.java

Source: https://stackoverflow.com/a/32377642