In the first quiz, question 3, you have the following options:
<p> v-bind:title="tooltip">Hover me to see the tooltip</p>
Should Be:
<p v-bind:title="tooltip">Hover me to see the tooltip</p>
And
<p> :tooltip="title">Hover me to see the tooltip</p>
Should Be:
<p :tooltip="title">Hover me to see the tooltip</p>