Built using the popular programming language, Python, SageMath is a useful open-source computer software that covers many aspects of mathematics and computer science by using mathematics libraries and a computer algebra system. Filling a gap in computer programming literature, this book features a unique introduction to SageMath as a programming language with a focus on learning computer programming, algorithms, and problem solving. This book focuses on developing a better understanding of the main programming concepts in SageMath, without requiring any programming background. This book also presents the mathematical functions on SageMath, such as the plots and Sage Interacts in order to present a better understanding of the programming concepts that are more interesting than classical "console applications." Topical coverage includes: computer science; computer programming; SageMath; Sage Cloud; Sage Interacts; computer algebra systems; input, processing, and output, variables, operators, and lists; Boolean expressions and relational operators; if statements; for loops and while loops; strings; functions and libraries; GUI programming and interacts; recursive functions and fractals; cryptography and Caesar Cipher; binary numbers; ASCII code; and sorting and searching.