B4J Question cross platform?!

You can reuse about 80% of the code. Most of the concepts are the same.

It is covered in the guides: https://www.b4x.com/android/documentation.html

Before I discovered B4J, I coded directly on B4A IDE; as code is most reusable, now I usually code directly with B4J and use conditional compilation to set platform B4X specific code

Sounds good.

Going to play with Desktop version for a bit then once I have got to grips with it progress onwards. As a VB6 user. Yet need a certain software to be cross platform.

Thanks Eral and Inakigarm.
Very highly appreciated for your help, advice and time.
Thank you and Best regards.

You may have a look at the B4x Booklets.

B4x Getting started
This booklet explains how to start with each B4x product (B4A, B4i, B4J and B4R).

B4x Basic Language.
This booklet explains the Basic Language for B4A, B4i, B4J and B4R.

B4x IDE
This booklet explains the Integrated Developpment Environment for B4A, B4i, B4J and B4R.