I collect original horror movie posters from the late-70's onward.
Early on, I got some of them professionally framed, but I go to lots of conventions and get them signed - so I've switched to front-loading snap-in frames. I buy these:
https://www.spotlightdisplays.com/
I'm also a big fan of Baroque portfolios for storing posters not in use. They're a little spendy, but high-quality and with acid-free/archival sleeves:
https://www.baroqueportfolios.com/
Some of the originals in my collection (all signed - most by lots of people - let me know if you want to see any pics):
Halloween 1-6, plus Rob Zombie's Halloween and Halloween 2018
A Nightmare on Elm Street 1-5 and Freddy vs Jason
Friday the 13th 1-8 and the the 2009 remake
The Thing
Scream 1, 5, and 6
The Return of the Living Dead
The Monster Squad
Creepshow
The Howling
Dawn of the Dead
Grindhouse
Escape from New York
Christine
The Texas Chainsaw Massacre Part 2
Demon Knight
April Fool's Day
From Beyond (Portuguese version)
My Bloody Valentine
Candyman
House of 1000 Corpses
The Thing prequel
...and lots of others I'm forgetting off the top of my head.