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The best way is a course: if you don't understand something, then the tutor can rephrase or explain until you do. They also require you to practice via homework, which means you learn better - we learn best by doing, not looking. Check locally for these.
The second best is a book: They are structured like a course is, and will "guide you through" the process introducing pretty much everything at sensible points and giving examples for you to code, helping the learning process. Addison Wesley, Wrox, and Microsoft Press all do excellent books that cover the subject well.
Websites are iffy - a lot of them have no idea how to teach, and even less how to learn. I'd avoid them as the very few good ones are hidden in a huge mas of dross.
The worst way is YouTube tutorials. There may be good ones out there, but I've never seen one, and all the ones I have seen have clearly known nothing about how to make a video, how to teach, how to learn, how to code and in some cases how to get the top of a bottle. Most of 'em are there purely for "Subscriptions" and the revenue stream that generates - few have any idea why code works when it does.
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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can you give suggestions for which courses that you mean? did you mean online or offline courses?
also, can you suggest couple of best book titles for this?
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actually, i'm reading "The C# Programming Language - Fourth Edition" by Andres Hejlsberg, Mads Torgersen, etc
but, i'll try to look to your suggestions
thx
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Well that is a bit more advanced, but an excellent reference. It was not clear from your question what actual level you are at.
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i actually learned some basics on C++ and seems like it doesn't really different with C#, so i wanna learn windows programming in both languages
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No they are very different. Try learning both together and you will get very confused. Stick with C#, it is much more intuitive.
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but wasn't C++ is used for many big applications? for me, i like them both... also java and C-like langs...
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Yes, but that has nothing to do with your question.
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i google-ed before i ask here but seems like it doesn't much tutorials for this
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I'm writing an ActiveX Controller to expose to COM and will plan to write an installer for it. I'm using some models for an ActiveX that used Java for HTML inputs. It was a model written for C#. I'm a beginner with the language. I'm a bit confused on how to tell the program that it should get its data from the control source of the report in MS Access (Office 365). I'm also not certain which methods should be private or public in the code when it passes information back and forth between the programs.
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Active X has been dead for decades. Why are you doing it this way?
Access is also pretty dead TBH
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For Access or other Office applications to use a custom library, it would have to be exposed via COM. 
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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You don't need to use ActiveX for COM. .NET supports COM out of the box with the aid of the COMVisible[^] attribute.
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I understand it needs exposure to COM, but I think the question here is more about how to reference Access as the source of the data the control uses to give its output. Specifically, how it would be referenced in a C# code.
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What would you suggest in place of Access in terms of working with databases?
Surely it must have wide use if it is continually updated in Office releases.
Is there software that gives you the ability to generate queries and reports with the same capabilities in formatting.
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I'd recommend you the SQL Server. Its Express edition is free.
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Access is useful if you have no programmers and want a simple DB with a simple UI. But it's pretty dead technology overall
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I do agree after reviewing some more information on this topic. I think I found a better solution than ActiveX or some of those older methods. Visual Studio has an RPLC reporting add-in that allows you to generate custom fields using C# behind the setup and simply imports the data from the existing datatable structure via OBDE.
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Since you never said what this ActiveX does, it's interesting to see how one builds a system to support it.
It was only in wine that he laid down no limit for himself, but he did not allow himself to be confused by it.
― Confucian Analects: Rules of Confucius about his food
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Sorry. That portion may not have copied into the post.
The input for the program would be the string from a field in the report in MS Access.
The program takes the string and uses the QR Coder Nugent Package to create a QR code image.
The program will output the QR code image as the object that is printed in the report.
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There is no clear reason why you think you need "ActiveX" in this scenario.
C# can read MS Access; create the QR image; and store / print "it".
The "Access report with the QR (string)" is some byproduct of Access.
Connect to data in an Access database - Visual Studio | Microsoft Docs
It was only in wine that he laid down no limit for himself, but he did not allow himself to be confused by it.
― Confucian Analects: Rules of Confucius about his food
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