I am an amateur PCB designer. Trying to design my first PCB. It's a two layer board with ESP8266 module. I have read lot about ground plane and copper pour at the bottom layer. I have tried to use all those knowledge while designing this PCB. Can someone please tell me if I made any BIG mistake here? Here is an image of the bottom layer..
Just a side-note, which I guess you already are familiar with: Take care for stray islands of copper (these are copper that are floating, not connected to GND or on any other signal). These islands can cause the signal to bounce on them, increasing cross talk issues.