vue instructions: two-way data binding

1 : only one who can achieve two-way data binding properties.
2 : two-way data binding: 
        V - M: wherein a change in the data, there is a further change
 3: v-bind and v- difference between the model: 
        V -bind can only be achieved from M -> Data Binding of V . 
        v - Model two-way data binding can be achieved.
4 : writing: 
    v - Model can only be used in form elements.