gyehyunbak's honest review, Solid Foundation! Starting Java Intensively Part 3 (Part 2): Sockets and File I/O course

I happened to take charge of modernizing a TCP/socket communication library product this time, so I hurriedly bought and finished the entire course. I realized that I didn't even really know what a socket was. Thanks to you, I received great help in understanding the overall picture and principles. Thank you.