What is the story on relays? How do I know good from mediocre? How many do I realistically need? Do I need to designate a specific relay to receive DM?

i presume I need to connect a wallet to pay for a paid relay - a concept I support - but how do I execute that? What does that process (the paying a relay part) look like? At present, are paid relays delivering any significant value vs free? How does one determine which paid relay(s) to support?

#askNostr