GtmDataLayer

【GTM 追蹤學】什麼是 dataLayer? 最詳細解說

https://www.maxlist.xyz/2023/06/01/gtm-datalayer/

Data Layer Variable in Google Tag Manager: How to Pull Important Data

https://measureschool.com/data-layer-variable/

Network 查詢 API Call 的位置

Network Intiator