If you are interested in learning more about designing with FPGAs, I'd recommend getting the book, Digital System Design With FPGA: Implementation Using Verilog And VHDL.
It discusses the development and deployment of FPGA-based digital systems using Verilog and VHDL. The book offers a solid foundation in FPGA principles, practices, and applications and more. It has real-world examples (some will be featured in our FPGA Essentials), ready-to-run code, and inexpensive start-to-finish projects for both the Basys and Arty boards.
If you would like to purchase the book, click here.