Can anyone recommend a step by step guide to building an app

[PyNovice]

Start bye looking at virtual environment and packaging at basic level.
I have several post about this,can link to some here, here, here, here.
In this tutorial i cover wide range of stuff regarding this.

Many project do create Packaging for you eg Django.
There are many tools for this to Poetry(Good), Cookiecutter.
There are Cookiecutter for many project eg Flask(tool i use most for web creation) cookiecutter-flask, cookiecutter-kivy...ect.

Tools can be fine,but getting basic knowledge about this toic first can help.
Python also have Python Packaging Authority,that maintain(also have tutorials) of
many these tool eg pip,wheel,setuptools(setup.py) ect.

Many thanks for these links. I will read through these today and I will post back here with some questions if I have them.

Thanks again