I've been on LinkedIn for about 10 years now. I still have no idea what it's for, or what I'm supposed to do on it. I don't even know if there's a way for me to

I've been on LinkedIn for about 10 years now. I still have no idea what it's for, or what I'm supposed to do on it. I don't even know if there's a way for me to pay to get different stuff than they show me. It clearly has an audience (every project manager I've had seems to love it), but that audience is equally clearly not me.