Why I need to study algorithms?
Programming is the process of taking an algorithm and encoding it into a notation, a programming language, so that it can be executed by a computer. Although many programming languages and many different types of computers exist, the important first step is the need to have the solution. Without an algorithm there can be no program.
How does it work in a computer?
Low-level language is an Assembler, that operates with bytes and processor commands. Middle-level languages, such as C and C++, build on top of Assembler and it provides more rich language constructions (variables, loops, conditions, functions, classes). And hight-level languages, like Python, build on top of middle-level language. With hight-level language you have a lot of built-in functions and language constuctions that do useful things.
You need to know how do they work internally and how to use them properly. This book will help you to find answers on these questions.