Thumbnail Post Navigation

Hello,

I’m looking to get thumbnail based post navigation functionality for my site (ala https://methanestudios.com/category/posters) and can’t figure out quite how to do this easily. Someone had previously recommended Galleriffic, however galleriffic is a slideshow only and doesn’t allow each enlarged image to have it’s own post (or page, whatever the case may be). I came across a number of tutorials but none address exactly how to do this. Is this a simple implementation? My knowledge of PHP is limited but I’m quite good at following directions!

Please help!!