[Questions] Found some cards

Hey guys,

I'm a big fan of any cards games and I'm kinda getting back into it. I found a lot of old cards and was checking out the price and the highest bid I got was over 700 euros.

I'm not sure if I want to sell them, but I'm curious which of this cards are worth so much, or is it just all of them together?

I hope you can help, i added some pictures in an album, you can find them here :
h ttps://ibb.co/album/N2BqB4

Any of your 1st edition Base/Fossil/Jungle in good condition are going to get you the highest price. Any holo e-reader cards too.

But you're a little indecisive about selling anyway, and I can tell you from experience that if your heart isn't in the sale, you'll regret it later.