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it depends on how you define "Synchronize":

• if you want to edit content, like WordPress, just log in and edit it.
• if it is not WordPress, you can also consider using the same database to do it.
• if they are all static pages, the GitHub upstairs can also be considered.
• if it is a production environment, one can be a host and one can be a reverse proxy and cache.

you can use the hook function of the version control software (both git and svn have this function). After configuration, every time you submit changes, the code will be automatically updated in the site directory (that is, your xampp directory). Please check the information on how to configure it.