schema.org implementation - q2a.io
Is this site good and trustable? Is this plugin is a must for google rich result?
AFAIK , there is builtin schema code in Q2A latest version
You don't need a plugin for that. The core can handle it on its own.
Navigate to admin/viewing and enable the setting Use schema.org microdata.
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April 20, 2021: Q2A 1.8.6 released!