Connection of my wi-fi network

• With an Iphone, what should I do if my Wi-Fi network doesn’t appear?
• After how long do I receive the "no network" notification?
• How long do I need to see the list of my Wi-Fi network when I select "Start Configuration"?
• What can I do when I choose my "Wi-Fi network" but just seeing a rounding circle?
• How long takes the notification « No network » to be received on a smartphone?
• What should I do if no Wi-Fi network appears?
• What does the notification "No network" mean?