I would like to change the template completely

[shaco (Kannen Rebez)]

I would like to change the template completely.

Where can I edit it? How do I access these files? Which ones are they?

I mean the default template
I don’t want to edit it from the admin panel because I can only add additional css code to it…

Thanks for help !

[Stranik (Evgeny)]

I think the following posts can help you with this.

Developing Discourse Plugins - Part 1 - Create a basic plugin

Building a plugin in Discourse can be really simple, once you learn a couple of quirks. The goal of this post is to create a skeleton plugin and introduce you to the basics. Your development environment Make sure you have a development environment of Discourse running on your computer. I recommend you use the appropriate setup guide and come back when you’re done. plugin.rb Use GitHub - discourse/discourse-plugin-skeleton: Template for Discourse plugins to create a complete discourse p…

Developing Discourse Themes & Theme Components

Discourse Themes and Theme Components can be used to customize the look, feel and functionality of Discourse’s frontend. This section of the developer guides aims to provide all the reference materials you need to develop simple themes for a single site, right up to complex open-source theme components. This introduction aims to provide a map of all the tools and APIs for theme development. If you prefer a step-by-step tutorial for theme development, jump straight to: Themes vs. Theme Compon…

It’s almost always better to use a theme than a plugin. Themes are much easier to install and maintain than plugins and are much less likely to disable your site in an upgrade.

Example

GitHub - discourse/discourse-simple-theme: Sam's simple discourse theme