if you search for "prototype board for esp32" or "breadboard for esp32" you can find the same board the author used. You can also find ones with strips for each

if you search for "prototype board for esp32" or "breadboard for esp32" you can find the same board the author used. You can also find ones with strips for each esp32 pin, instead of just a via and pad. And you can find solderless versions where the connections push in vertically (typically white with five holes connected perpendicular to the "valley" that a DIP chip would insert). And you can find "breakout boards" with sockets for the esp32 and pin headers and screw terminals for each pin.