You can actually have a turing complete instruction set with only one instruction. I am not sure as to the practicality but here is a wikipedia link to read. https://en.wikipedia.org/wiki/One_instruction_set_computer
You can actually have a turing complete instruction set with only one instruction. I am not sure as to the practicality but here is a wikipedia link to read. https://en.wikipedia.org/wiki/One_instruction_set_computer