I want some sites to teach me how to work on ubuntu mace windows programs

Python is a fairly straightforward language that you can get started with, and it'll work on most platforms. I'd recommend checking out any of the MOOCs about learning Python, such as this one.

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Hello , "Timokeefe " is 100% correct , Python is a fairly straightforward language you can use this for your application , I have developed bigger application in Python language . If you need any help feel free let me know.
Thanks
Dipak Tewary
skype : dipak.tewary1

these are not meagre apps but are OS. You might need to have a deep understanding of a few programming languages

I suggest python language..python very useful and easy to understand

I believe you are trying to build simple application with window, buttons etc.
Bet way to start is to get yourself a Microsoft Visual Studio (because it is beginner-friendly), and find some beginners tutorials on YouTube.

To make a serious application like Kdenlive you will need to develop serious programming skills, and maybe a year time.

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Pluralsight.com - best courses but costs $30/month
youtube.com - many courses are outdated and/or not very well done or not done by actual experts, but it's free.

Want to know some sites that will teach you how to make an application? Here are some useful stuffs for developing Windows programs that I can give:

1. There is an official "Windows Documentation | Microsoft Docs" for developing Windows apps.
2. You can learn AutoIt to create a manipulating program with GUI by just writing directives, AutoHotKey is its competitor.

You can also apply to an online course to study a programming language.

Python can be a handy tool for that. It also deals very well with bigdata programmes like ubuntu and windows.