This is exactly the type of book that I would recommend to junior data scientists starting with time series analysis. The book introduces a series of quantitative and qualitative methods for time series forecasting, both with intuitive explanations and numerical examples (carried out in R and accompanied by the corresponding code snippets). To keep the material accessible, most of the mathematical details are omitted.
I still decided to reward the book with only three stars for two reasons: First, although I appreciate its simplicity, I had the feeling that some content has been oversimplified to the extent of simply being wrong. Just to give one example, the authors write that "for a stationary time series, the [autocorrelation function] will drop to zero relatively quickly, while the [autocorrelation function] of non-stationary data decreases slowly". This is wrong, as there are non-stationary time series for which the autocorrelation function drops quickly (e.g., a sequence of independent, but not identically distributed random variables), as well as stationary time series for which the autocorrelation function drops very slowly (e.g., a first-order autoregressive process with a defining pole close to one). The second reason for giving only three stars are the last three chapters: Forecasting hierarchical or grouped time series, advanced forecasting methods, and practical forecasting issues. These three chapters consider a lot of different topics (bootstrapping, ensemble methods, backcasting, neural networks, etc.), but each topic is covered too briefly to be able to understand the main concepts behind them.