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How can I redirect all my 404 routes to the home page without changing my .htaccess file?
I'd like to know some Admin configuration or module.
A simple way of doing this, log in to the admin and go to Stores > Configuration > General > Web and change the drop-down value for CMS No Route Page in the Default Pages section. You should be able to select your CMS Home Page like the image below:
Required, but never shown