Wi-Fi: do I need to register every time I use WiFi network?

This is basic question but I'm not quite sure about using Edge network and WiFi network on my iPhone.
Mostly, I set
- WiFi "on"
- Ask to join networks "on"
So, always available WiFi networks come up when I use my iPhone. But I usually cancel to use it and just use iPhone on Edge network.(feel like internet is slow.)
Do I need to register or sign-up whenever I use Wi Fi network?
And if I see 'lock' sign with Wi Fi network, do I need to know their password? Do I need to join their WiFi network and they charge fee?
Thanks in advance for help!

Do I need to register or sign-up whenever I use Wi Fi network?
Depends on the available Wi-Fi network. If at work or at the house of a friend or relative, there is no registration required but if the network is password protected, you must be given the password required to access the network.
And if I see 'lock' sign with Wi Fi network, do I need to know their password?
Yes - this means the network or password protected.
Do I need to join their WiFi network and they charge fee?
This depends on if the provider of the network requires payment for access. As an example, Starbucks uses T-Mobile for their Wi-Fi network available at each store but accessing it is not free and requires payment.
Some independent coffee shops, chain restaurants and businesses offer free Wi-Fi access for their customers and if not password protected, all you need to do is join the network - accept it and you will have access.

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