How to learn how to develop an application?

Question

C++ / C#

Hello.
I'm learning c# and SQL In the future, I want to get a job as a junior.
Programming. certainly. at the level of a couple of functions in main in pure C ( hello word and the like) Now I want to write
a trial educational application for myself, in order to : process What I want to write: Let's say a business application that registers loans or deposits with a simple GUI on WF or WPF and writes data to the database. Question:
I have scattered knowledge. There is no understanding of how these parts should be connected together or something (program, GUI and transactions in the database. How it should look like in reality in Visual Studio, etc. all this should descend from classes into one main function or there should be several programs communicating with each other in a chain)
Advise books (I myself didn’t find something similar), are there any, specifically on the physical development of an application (not on patterns) or maybe somewhere on the Internet you can look at the code of something educationally similar?

Answer 1

First, look at databases.

Answer 2

I will support the above answer, in addition I will write
study:
-ado.net :
--entity framework
--nhibernate
-design patterns ( mvc, mvvm, and etc )