Learning OpenCart 3 Theme development

Hi

I want to learn how to manipulate the themes and create my own themese, etc in OpenCart 3
Also wouldn't mind learning the extensions (I got quite handy with vqmod in 1.5 days... but realise this has all changed

Any recommendations of places to go and learn, as I am finding OC3 resources very hard to come across... and I am not sure how many differences between 2 and 3 there are

Any advice and help greatly appreciated

Tristan

after creating 2-3 new template based on opencart's default theme, i begin to create my new real theme for my own store using uikit instead of bootstrap. it is not completed yet.
https://github.com/nasserman/upenkit

the main difference between version 2 and 3 is that for opencart version 3, you must use twig engine in tpl files instead of raw php codes. i like it. for creating new theme you can start with empty folder and copy/paste files from default theme, or copy/paste its all files and modify each of theme.

I went to add a new theme that was blank so I could modify small bits here and there
I followed the guide here https://code.tutsplus.com/tutorials/cre ... -cms-21865 as i was hoping it would be similar
I can;t see how to apply this theme to the default store... in the Store Settings it only shows the default theme, not the new one I just set up a folder structure for

any advice here would be greatly appreciated

thanks

Tris