Link Missing FIxtures how to use it?

Hello ,
i am searching for how to use fixtures ,
all answer pointing to
https://frappe.io/kb/app-development/how-to-add-customizations-to-app
the is link missing

I want to know the best approach to customization using fixtures …
thanks

Hi @ahmad18189,
please use this Link
http://frappe.github.io/erpnext/user/manual/en/customize-erpnext/

Thanks.