Question on Initial node Connection

I have a quite more technical question regarding how Monero nodes (and other P2P networks) work.

The question is: Once you start your node for the first time, or after it being shut down, how does the node find the first P2P peer?

I get that torrents for instance use trackers for this. But how does Monero (or other cryptos) do it?

I am guessing Haveno does the same thing? ie: Haveno is essentially connecting to two P2P networks at the same time, namely the Monero and the Haveno networks. What tech does Haveno use to find the first peers? Is it related to the seed nodes?

How does Monero do it without seed nodes?