Build extension

I want to build an extension, could you explain to me what should I do?

Which type of extension you want to build ?
Do you have some knowledge of java ?

@Muhammad_zain I was looking at the tutorial on MIT App inventor, but I don’t know if it’s the same way to start developing for appzard

Extension can be used in any app inventor even appzard.
You can use Niotron ide to develop extension. Thus will help you to create extension without install any software