Starter. (parts 1-4)
https://numato.com/kb/learning-fpga-verilog-beginners-guide-part-1-introduction/
Very fast Youtube primer:
https://www.youtube.com/watch?v=vmraRVxKYss
https://www.youtube.com/watch?v=xzUph-a_HaY
https://www.youtube.com/watch?v=QlscDcbKUV4
Loose tutorial / Exams
https://hdlbits.01xz.net/
Playground (write Verilog and see what happens)
https://www.edaplayground.com/