- https://nandgame.com/
- https://www.asic-world.com/verilog/verilog_one_day.html
- https://hdlbits.01xz.net/wiki/Problem_sets
- https://edaplayground.com/home
And it's associated starter FPGA: https://nandland.com/the-go-board/
If you outgrow this I would recommend moving to some sort of Xilinx Arty Spartan board
- https://nandgame.com/
- https://www.asic-world.com/verilog/verilog_one_day.html
- https://hdlbits.01xz.net/wiki/Problem_sets
- https://edaplayground.com/home