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The "basic of basic" of anything is energy. Put energy into certain forms, and it becomes what we know as sub-atomic particles. These interact in certain ways, and are associated with energy, in ways that can be described mathematically. Based on that description it is possible to build a model of how the main building blocks of atoms (electrons, protons, and neutrons) behave. From that point, it is possible to build a model of how atoms behave. Then, models describing basic chemical and physical characteristics of matter may be built. These may be used to build models of simple electronic components, which can be used to build a model of a computer. Once you have a model of a computer, you can build a model of how to control it. One of those models will involve machine instructions, and sets of machine instructions, which can be used in various ways to assemble something called software.
If all you want to do is write a "Hello world" program, starting from the "basic of basics" may take a while. Alternatively, you might want to read some introductory materials on computer programming.
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