Customizer.php and template.tags

Hi,

I am afraid this is not easy.
You will need to know how to use the customizer api in order to create your own customizer options.

Here are some related documentation.

Customizer tutorials and documentation

https://ottopress.com/2015/whats-new-with-the-customizer/

Your can start your work from underscore, which will help you create a base theme that has a simple customizer, which you can extend your work.

https://underscores.me/

Hope this helps.

Thank you

Thank you very much for your interest and for your return, a very good benefit grateful to you for sharing for me

You are welcome.
Thank you