You don't need to learn LUA anymore.
Welcome to RDX world.
The IDE (Integrated Development Editor) is built in the game.
You can create some panels.
With the IDE, you can edit each panels, add some simple elements (frame, buttons, textures, font) or complexe elements (health bar, totem bar etc ...). You can apply some shaders, colors using conditions.
The IDE will generate the LUA code of your panel and execute it on your UI.
The IDE concept:
http://www.wowrdx.com/before-begining/ide-editor
Tutorials here:
http://www.wowrdx.com/tutorials-basic
Learn more about RDX and the multi user interface manager:
http://www.wowrdx.com
And then, join the community of "no more LUA !!!"
Best regards
Sigg