It is impossible to suggest just one book covering everything related to DFT and its practical implementations. However, assuming you are a beginner, the following are my picks to get started.
Materials Modelling using Density Functional Theory by Feliciano Giustino. It gives you a general overview of the subject and its scope. https://global.oup.com/academic/product/materials-modelling-using-density-functional-theory-9780199662432?cc=in&lang=en&
Density Functional Theory: A Practical Introduction by David S. Sholl and Janice A. Steckels to understand the theory aligned more towards the practical aspects of DFT simulations.