Hello, completely new to LimeSurvey!

Is it possible to create a simple survey and when the user clicks submit is redirected to a custom thank you page?

Yes, that is called "End message".

End message: This allows you to enter a message that will display when a participant completes your survey. (ie: "Thank you for completing our survey. We will publish results soon."). You can incorporate HTML elements such as images or videos in this section using the WYSIWYG editor

Depending on your LimeSurvey version you'll find that via Survey properties.

Hey thanks, Jelo! Just to clarify, I can redirect to another different URL immediately when the user clicks submit?

levivivas wrote: Hey thanks, Jelo! Just to clarify, I can redirect to another different URL immediately when the user clicks submit?

If the thank you page is external, you can use the EndURL setting, where you enter the URL.

End URL: This URL will be presented as a link at the end of the survey, and allows you to direct your participants back to your home page (or, in fact, anywhere).

This happens after submit is clicked.

To automatically redirect to the URL you need to activate the Autoload in the navigation setting.

Automatically load URL when survey complete: