Learn how to Pass a Javascript variable to PHP in WordPress using Ajax jQuery

Source Code:
– Template: https://drive.google.com/file/d/1A9OFK76eDnrQqq-MxxJTX-e_NJDGkGKo/view?usp=sharing
– Index: https://drive.google.com/file/d/1wCfxokf5Osp5m_W_oESF7_gV0MCFqOTX/view?usp=sharing