How can i connect 01 ESP8266 to a shift register?
While I do believe you could use GPIO2, TX, and RX for your connections, I don't think the clock is explicitly exposed on the ESP-01. That means your code would have to "emulate" a clock via GPIO2 (most likely) with that pin going to your shift register's clock pin. That said, it's really hackish and I'd recommend other ESP dev board that has a pin for the onboard clock.