what does "low address bits are meaningless" mean?
There's no such network as 192.168.0.1/24, because it doesn't start on a legitimate boundary between /24 network ranges. The last bit of the address is set, but is meaningless in this context. The correct address would be 192.168.0.0/24, which means the range from 192.168.0.0 to 192.168.0.255.