Answer 1

You basically called "the object in the object" :). So you called an object, when its not created fully. In your code just take the log and the object property call outside your object like that:
let flower = {
height :7,
color:`white`,
ltr(){
this.height +=2;
}
};
flower.ltr();
console.log(floower.height);
And change "floower" to flower ;)