Hello, I am new to nodeBB. I want to achieve the layout like above theme, how can I start with? and what files (.tpl, .less) should be edited?

And I want to do more csutom layout/theme, should I use the plugin(eg. nodebb-plugin-custom-pages). Or, start with "nodebb-theme-quickstart" ( Quickstart your NodeBB theme development ). I don't know to edit the layout/theme/ .less for custom-pages, and no idea to start with.

Could anyone gice me some suggestion? Thanks a lot.