How to create User testing app

What type of technologies are best used to create a user testing site. Currently I only know html, css, javascript and am learning some javascript related backend technologies but I’m curious as to what specific ones I should learn to make a user testing app

A user testing app? Are you testing users or is it to aid users with testing?
The tech you are using will do the job I believe, for either.

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An app where a user can submit his/her site and receive feedback.

Many different ways to do this. You can store the data on the server in a text file or (more complicated) in a database.
FCC course teaches you how to do this.

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