I just got a MacBook Air 2025 model and I want to connect it to 5G internet. I've just signed up with a service provider and ordered a 5G modem/router. Do I also need a 5G dongle for my laptop or will I be able to connect directly? Thank you

[Re-Titled by Moderator]

Original Title: Hello, how can I connect my 2015 Macbook Air to 5G internet? Do I just need a 5G modem or do I also need a 5G dongle?