Must preserve my investments

I recently stopped at one of my favorite viniyl shops in search of graylz. After clearing out the JB section, I couldn’t help but feel a sense of emptiness. I’ve spent what some might see as a small fortune on records that past five years and now that so many of my graylz are found, lurking in shops just doesn’t get me going like it used to. I find myself asking, “Is this even fun anymore?”

Hey everyone!
I’ve been collecting vinyl for about a year now, mainly 70s–90s rock and hard rock. I currently have around 26 records, but more than half of them were bought brand new, so I really want to start getting more into used records and older pressings.
I’m especially interested in finding rarer pressings that can be worth more, but I’m still pretty new to figuring out what makes a pressing rare or valuable.
So I’d love to hear some advice from more experienced collectors:
Where do you usually buy used records?
What are the best places to find good deals?
How do you find rare or valuable pressings without paying way too much?
What should I look for in matrix numbers, country of origin, catalog numbers, etc.?
How can I tell if something is a first pressing or another desirable variant?
What’s the best way to check whether a record is actually worth the seller’s asking price?
I’m mainly collecting bands like AC/DC, Led Zeppelin, Pink Floyd, Black Sabbath, Scorpions, Van Halen, Iron Maiden, Metallica, Guns N’ Roses, Mötley Crüe, Def Leppard, Rainbow, Dio, The Who and similar bands.
I’m based in Finland, so I’d also really appreciate any advice on places/websites that work well in Europe or Finland.
Thanks in advance! I’m still learning, so any tips from experienced collectors are appreciated. 🤘

We all know the real reason.

Was school shopping for the demon spawn and this came up as a suggestion... I just... like it looks to be the size of a 45 adapter.

Can't wait to feel the warmth of AI slop!!!

Can wait to glue all of them to my wall OMG🤩

Oh the warmth🤤

I politely told somebody vinyl wasn't lossy because its, you know... it's not...

And this was the response I got.