What is the real value of bitcoin?

Hi guys, I hope u can finally help me understand this. I asked this in a comment, but didn’t get an answer. I just can’t wrap my head around it, so I need your help to at least get an idea. ????

Can you tell be what exactly the value is? I mean, I understand pow and that it needs some work in form of computational power to to to mine the coins. I also understand that the amount of power needed increases over time, because of difficulty increase. But what I don’t understand is, just because something is hard to get, doesn’t mean necessarily that it has any value. I could climb in an active volcano and grab a stone out of it. It would be really hard, but in the end it still is just a stone. So besides of the difficulty to actually mine bitcoin, what is value of it?

Edit: thank u very much for your answers. Pretty much to think about, I have now ????