> For the complete documentation index, see [llms.txt](https://help.bluecore.vn/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.bluecore.vn/english/blog.md).

# Blog

- [Introduction to CRON Expression](https://help.bluecore.vn/english/blog/introduction-to-cron-expression.md)
- [Đăng ký mẫu tin nhắn ZNS](https://help.bluecore.vn/english/blog/dang-ky-mau-tin-nhan-zns.md)
- [Hướng dẫn sử dụng BigQuery riêng để làm kho lưu trữ dữ liệu tại Bluecore](https://help.bluecore.vn/english/blog/huong-dan-su-dung-bigquery-rieng-de-lam-kho-luu-tru-du-lieu-tai-bluecore.md)
- [Thời gian cho phép gởi tin nhắn quảng cáo](https://help.bluecore.vn/english/blog/thoi-gian-cho-phep-goi-tin-nhan-quang-cao.md)