Does selling programming services mean..

You sell a specific program (app, theme, plugin, bot etc.) you either created or you studied a lot? AKA a programmer can't offer any programming service to someone who use a program that the programmer didn't study or created? will the programmer be clueless about the code because it's not his own? is that what happens when a company hires you? do you study their code first?

What I mean with this is that in programming what matters is not the language but the program you create with it right?, also if you have to be familiar with the code of that program because you created it or studied it.

Is that right? I guess css and html are an exception because the code is always readable?

You mean if other people are able to edit the source code of a program another person wrote?
If that's your question then the answer is: Yes, it is possible to work on a program, even though you are not the creator
Check out Github, lots of code that people wrote and complete strangers contributed to
Every programmer has their own style of coding, so it might take some time to get into the code, but it's still not too hard to work with another person's code
You can't really compare HTML/CSS to programming languages like C++ or C#, as HTML and CSS aren't even programming languages
But there are certain things in programming languages that never change, no matter who wrote the code; for instance the main {} function in C++ has to be included in every program.
The way you declare loops, variables and so on also stays the same (unless you use pointers, but if you've worked with the language for a while it should not make that big of a difference)

what about working on a completely different program than the one you are familiar with but it was created with the same language? aka will someone who knows Java and his specialty is to build gaming bots to work on backend developer stuff? if not how much would it take for him to master and work on backend developing considering he already knows the language?

GodThor said:

what about working on a completely different program than the one you are familiar with but it was created with the same language? aka will someone who knows Java and his specialty is to build gaming bots to work on backend developer stuff? if not how much would it take for him to master and work on backend developing considering he already knows the language?

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I am not familiar with Java, but I think you can't answer that question
Some basic stuff should be pretty easy to pick up on, but if you wanna go more in depth it's gonna take some time, even if you already got in depth knowledge about botting
But knowing the language and having worked with it for a long time, even if on different types of programs, is going to give you a big advantage, as there are certain things that you will need for gaming bots as well as for back-end development
If there are any things that you need for back-end development that you have never heard of, like some specific functions, you will just have to look into these and study them, no other way to master imo

Realistically you get deeper into some languages than others. Syntax wise, you can theoretically change processes from one language to another. Programming is logic above all. But there is obviously a steep learing curve no matter what specific flavor you feel inclined to use.

GodThor said:

what about working on a completely different program than the one you are familiar with but it was created with the same language? aka will someone who knows Java and his specialty is to build gaming bots to work on backend developer stuff? if not how much would it take for him to master and work on backend developing considering he already knows the language?

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As a rule of thumb, always differentiate between object oriented and functional programming languages.
If someone knows C#, they'd be able to pick up Java with ease, or even Dart if necessary. Programming languages are merely tools, most of them follow the same syntax, just with different writing styles.

However, if all you know is HTML/CSS then... yeah. It'll take you a while to learn anything, as HTML is just a markup language.
If you'd be a Python developer, you'd have a hard time getting into Perl or C++ too.

GodThor said:

You sell a specific program (app, theme, plugin, bot etc.) you either created or you studied a lot? AKA a programmer can't offer any programming service to someone who use a program that the programmer didn't study or created? will the programmer be clueless about the code because it's not his own?

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Generally, if he or she is following good coding practices (the creator of the source code) your "programmer" would be able to pick up on it pretty quick thanks to camel case and definite function names, or in general parameters that are being taught to develop faster and better organized codebases.