When someone shares a link in any social media such as Linkedin, Facebook or Twitter, your link might generate a preview or not. This is not a random thing, you need to add some meta tags to your page.
For example, for twitter purposes you must add:
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:site" content="@chooseyourplant">
<meta name="twitter:creator" content="@chooseyourplant">
<meta name="twitter:title" content="All you need to know about Sansevieria Trifasciata Bantels Sensation | ChooseYourPlant">
<meta name="twitter:description" content="Discover all the features of a Sansevieria Trifasciata Bantels Sensation plant and how to take care of it.">
<meta name="twitter:domain" content="chooseyourplant.com">
<meta name="twitter:image" content="https://www.chooseyourplant.com/static/images/media-share/plants.jpg">
So even though in the future I'll generate them automatically as indiehackers.com does, they will be super useful for a while.
I created the thumbnails for:
With this, links, when shared on social media, will have a better conversion rate.