How can I transform a HTML form in a template into an email that someone can receive after they fill it out with any paid add-ons? If I need an add-on for that, can anyone suggest any?
There is also a free version of Freeform. https://solspace.com/expressionengine/freeform
There is a contact form bundled with ExpressionEngine: https://docs.expressionengine.com/latest/add-ons/email/contact_form.html