Windows saves tracking data on files downloaded from the Internet. If you copy paste a file and see stuff like this in your project:
Untracked files: (use "git add <file>..." to include in what will be committed) public/assets/check.svg public/assets/check.svg:Zone.Identifier public/assets/spinner.png public/assets/spinner.png:Zone.Identifier public/assets/spinner.svg public/assets/spinner.svg:Zone.Identifier
...It will annoy you.
To remove the problem: Run gpedit.msc (Win + R) and go to:
User configuration
> Administrative templates
>Windows Components
> Attachment Manager and set Do not preserve zone information in file attachments. (to run gpedit.msc you’ll need Windows Professional)