Introduction - If you have any usage issues, please Google them yourself
Learn the introductory books of FPGA. The main contents include logic circuit, combinational logic, arithmetic operation circuit, storage element, synchronous sequential circuit (finite state machine), asynchronous sequential circuit, test and so on. "Digital logic base and Verilog design" (second edition of the original book) is full of content, clear concept, combined with the development of the latest technology of logical design.