How are you actually supposed to network / LinkedIn?

I've been having a particularly rough time finding a new job in the field I graduated in. I'm doing pretty much everything most job sites have told me but networking is kinda hard.

I don't currently work in my field so I don't know anyone that would be particularly useful. Everyone I know is already aware of my situation and some of them have even found leads for me but no luck yet.

I have gone to events related to organizations I'm interested in and spoken to people there but it feels super weird to just approach people and tell them I'm looking for a job.

Similarly Linkedin is super foreign to me. This post is literally the most I've ever interacted with a social media site. What do I do once I open that app? Am I supposed to just stalk people on there that might hire me someday? I tried joining a "group" but it's been pending for a week now.