C-language source code, a procedural programming language. The resulting program prints "hello, world" on the computer screen. This first known "Hello world" snippet from the seminal book The C Programming Language originates from Brian Kernighan in the Bell Laboratories in 1974.
Computer operations require a system of signals that represent letters or numbers in transmitting messages. These signals give instructions in a computer program. Instructions written by a programmer in a programming language are called source code. The source code is often transformed by an assembler or compiler into binary machine code understood by the computer.
Hour of Code is an initiative that provides students with an hour to learn to program. This is a global movement by Computer Science Education Week and Code.org reaching tens of millions of students in over 180 countries through a one-hour introduction to computer science and computer programming.
Kahn Academy Hour of Code is a great way to develop your skills at basic coding.
Watch this one too!
Sign up for Hour of Code here.
Another helpful site is Adam Dachis's Learn to Code: The Full Beginner's Guide. You may down load a PDF of this to keep handy.
Related reading: Coding Conventions; Five Steps to Understanding HTML Code; How to Code: 15 Steps; Design and Code Your First Website