How can I use WiFi Map?

Excuse me, could you please explain how exactly I can utilize the WiFi Map application? I'm interested in understanding the CORE functionality and how it can benefit me when I'm on the go. Specifically, I'd like to know if it's straightforward to find and connect to nearby WiFi networks, and if there are any safety precautions I should take while using it. Additionally, are there any features that allow me to share my own WiFi network details securely with others? Lastly, could you elaborate on any subscription options or costs associated with accessing advanced features, if any?