This book is available freely online, or you can purchase a physical copy. It uses R to show time series graphics, exponential smoothing, Box-Jenkins ARIMA models, and some more advanced methods.
Rob J Hyndman and George Athanasopoulos. Forecasting: Principles and Practice (3rd ed). OTexts: Melbourne, Australia, 2021. Available in [html format][ref-hyndman 2021].