1. In arrow function you can omit the curly braces and the return statement when the function is a 1 liner.

const myFunc = (a, b) => a + b
console.log(myFunc(1, 2))

// log : 3

1. In arrow function when it has only 1 argument, parenthesis is optional

const myFunc = a => a*a

console.log(myFunc(3))
// log : 9

1. In arrow function the this key word is automatically bound to the parent's context

this refers to the object that is currently executing the function