ESP8266: guide from zero

Hello guys
I'm new to the group, I just wrote, if someone can help me, I need a guide or even a book to buy to learn how to use esp8266 to send data between a server and a client (ex: I have 2 esp8266 one I want to use it as server and the other as a client and have them talk to each other)
Thanks in advance
I'm new to the group, I just wrote, if someone can help me, I need a guide or even a book to buy to learn how to use esp8266 to send data between a server and a client (ex: I have 2 esp8266 one I want to use it as server and the other as a client and have them talk to each other)
Thanks in advance