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In this video tutorial for OCR entry level certificates in computer science, the first lesson focuses on the components of a computer system in preparation for test one. It defines a computer system as an electronic device equipped with a method for inputting data, a microprocessor for processing that data, and a method for outputting the processed data for human understanding. The lesson distinguishes between two types of computer systems: embedded systems, which contain pre-programmed microprocessor instructions that cannot typically be changed, and personal computers. It emphasizes understanding how to classify computer components in terms of input, output, and storage devices.