I haven’t checked your links, but when you want to do this, there’s one CMS strategy, mostly.
So say you have a collection of works for your portfolio. But on the homepage you want to link only 3 of them, the important ones.
Create a switch field, or an option field in your collection. Something that you’ll call “Featured”. Say it’s a switch.
On your homepage, drag a collection list, limit it to “Posts that have the Featured switch ON” and add a button link in the list item, linked to “current work”.
Is it what you’re trying to do?