What Are Source Codes?

Source code is the guts of an application that makes it work before it is compiled own, or bundled for interpretation. It is the part of the target file that is written by the user to create what they want.

The position of code (the syntax) is dependent on the language being written in. Some languages require code be in the order it is used (function wise) or it will not compile properly. Others do not require any special order and will compile in any order the code is written. That is entirely dependent on the language itself.

Also coding is not copy pasting.

That all depends on what language you are looking to learn. Every language is created for a reason and has their own advantages, disadvantages, and key points for being made. You need to pick a language that suits your needs and your abilities.

Any language, regardless of what you pick you are going to have to read and learn. It's more dependent on what you want to use the language for.
What type of things do you want to make?

If your end result is making games, I would recommend C/C++ personally. I'm sure plenty of others will tell you other languages but again, it's all personal opinion.
There is a sticky in the C++ section with recommended links/books etc. here:
http://www.mpgh.net/forum/31-c-c-pro...resources.html

For an IDE/compiler I recommend (if you are using Windows) to use Visual Studio 2012 as well.

Personally I didn't learn from books, didn't care to buy them and I dislike reading full length things (like books) on a computer screen.
Get newer books though, older ones teach old practices that are not valid/fast/worthwhile in todays industries and such though. (Not saying all old books are horrible.)

C++ Primer Plus (Sixth Edition) would be a decent start as it includes C++11 standard info and such which is the new standards for C++ and is currently being implemented into all C++ compilers.

This list from StackOverflow is fairly well maintained and put into groups based on skill level:
c++ faq - The Definitive C++ Book Guide and List - Stack Overflow

I was working on a private project with someone a while back and was asked to join a popular closed source project for a game which required that I learned C/C++ to get into things. So I took the initiative to learn it myself via the internet.

I learned from tutorials/sites that explained things in depth. As well as reviewing parts of the C/C++ standards.
Trial and error, studying others code, reading through the MSDN for Windows specific things like API, etc.