Essential Books

Constants

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Go supports constants of character, string, boolean, and numeric values.

Basics of constants 

const (
	i  int = 32       // int constant
	s      = "string" // string constant
	i2     = 33       // untyped number constant
)

var (
	// values that are not read-only (like slices or maps or structs) cannot be
	// constants
	// we can declare them as top-level variables
	b = []byte{3, 4} // this could not be a constant
)
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Basic types:
* Booleans
* Integers
* Floating-point numbers
* Characters and runes
* Strings
* Constants
* Enums
* Arrays
* Slices
* Maps
* Structs
* Interfaces
* Empty interface
* Pointers
* Unions
* Channels
* Zero values
* Type casting
* Type aliases
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