Ahh, okay, so if I wanted to go just looking at a specific subject it might be better to make a second account and join another instance, and keep up two accounts?

Thank you!

Ah, thank you! I downloaded an app first, since I primarily use my phone for everything and apps are just easier. I think the one I'm using is called Boost? It is less confusing than I was worried it might be :)

I saw a mention of Lemmy on a random thread in r/politics so I'm tentatively having a poke about, since I've already tried to quit Reddit once (for Tumblr - it didn't stick). I remember forums pre centralised internet, is it something like that?