How do I know my network is secure and how do check

Hello 19Dursley67,
 
Welcome to the Webroot Community,
 
Are you using Webroot? Then look here at this KB Article https://community.webroot.com/t5/Webroot-SecureAnywhere-Antivirus/How-do-I-know-that-Webroot-is-working/ta-p/191121
and also here you have Webroot Firewall and Windows Firewall working together as explained here: 
http://live.webrootanywhere.com/content/599/Managing-Firewalls
 
Look at this post by TripleHelix https://community.webroot.com/t5/Webroot-SecureAnywhere-Complete/how-do-i-know-that-my-home-computer-is-security-enabled-network/m-p/175696/highlight/true#M9883
 
Also you didn't mention if you are asking about a Wired Network or a Wireless Network ..please look here https://www.microsoft.com/en-us/search/result.aspx?q=how%20to%20protect%20my%20network
 
Hope this helps?