Final answer:
The first section of the 'Liber Abaci' by Fibonacci details arithmetic and basic operations, including the use of Hindu-Arabic numerals and practical applications in commerce and measurement.
Step-by-step explanation:
The first section of the Liber Abaci, written by Leonardo of Pisa who is also known as Fibonacci, primarily describes arithmetic and basic operations. This foundational work, composed in the early 13th century, was instrumental in introducing the Hindu-Arabic numeral system to the Western world, showcasing its application to various practical problems, including commerce, measurement, and finance. The book's coverage extends from simple calculations to more complex problems that involve the rules of arithmetic, including addition, subtraction, multiplication, and division with whole numbers and fractions.