Integers

u: unsigned (positive only). Range goes from 0 to the bytes of type.

int8 is −128 to 127

uint8 is 0 to 255

int, int8, int16, int32, int64 // Int depend on OS architecture (32, 64 bits)
uint, uint8, uint16, uint32, uint64 // uint depend on OS architecture (32, 64 bits) 
uintptr // used only for low-level programming, such as at the boundary of a Go program with a C library
byte // alias for uint8. It's an emphasizes that the value is a piece of raw data
rune // alias for int32
complex64 complex128

int is not the same type as int32 and an explicit conversion is required to use int values where an int32 is needed