No worries…I actually plan on writing a tutorial about creating a front page like the live demo. But to help you get started, the images you see on the demo are done with a text widget in sidebar positions 1, 2, 3, and 4.
Here is a code snippet of the first one that you can use as a template.
<div class="animated bounceInLeft">
<img src="https://demos.shapedpixels.com/longevity/wp-content/uploads/sites/3/2015/07/fp1.jpg">
<h3 style="font-size: 1.25rem; text-align:center">Several Colour Choices</h3><p style="text-align:center">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vestibulum nec lorem urna. Vestibulum fermentum libero ut ante consectetur dictum vitae nece.</p><p style="text-align:center"><a class="btn btn-sm blue" href="#">See More</a></p>
</div>
You will need to change the image though and the other content parts such as the text and also replace the # symbol with an actual link.