The router security checklist is way too overwhelming & overkill for the regular user. I would rather suggest the following link which is not so overwhelming yet provides tight security if you follow all steps:
As far as I'm concerned, both of these resources are gross overkill for your average home user, though the techwiser.com article is by far more user friendly.
Unless you live in an area of high population density most of the things these articles talk about really don't matter all that much. In an area such as the small city in which I live, and in a suburban area within the formal city limits, my WiFi signal might carry a bit outside the limits of my own yard, but not by much. The only way that someone could tap in to my WiFi for any period of time would be to be very nearby, probably in a car parked just outside my house, which I'd notice if an unfamiliar vehicle were suddenly to show up and stay in front of my house.
The basic things that both of these resources recommend that are essential, and generally enough for any home user, are:
1. Always change your router's login ID (if supported, many will not let you change the login ID from admin) and password such that you can remember it but that it's not obvious. You can safely leave the password unchanged if the router uses something like its own serial number, but I don't recommend that since it's not likely you'll remember it when you need to log in to the router to tweak something or check something. See step three as far as how to create a strong, yet memorable, password and use that method here.
2. Always change the network name (SSID) to something that's meaningful to you but would not be meaningful to a random passerby who might pick up the SSID being broadcast if you do not choose to hide it. If you have frequent occasion to grant friends, house guests, or similar access to your WiFi you probably won't hide the SSID from broadcast.
3. Make the password for your network long enough and strong enough not to be easily guessed, but such that you can easily remember it. I always recommend the portmanteau method of creating a password where you take three things familiar to you and put them together. Lets say you grew up in Las Vegas, at the address 158 Vista Way, and got married in 1993. You could have a very easy to remember (for you) but very difficult to guess or hack (for others) password in Vegas158Vista1993. Adding a favorite special character at the beginning or end helps a bit, too. You can use any "formula" for your portmanteau that makes sense to you and that will be easy for you to remember.
4. Also change your security to WPA2 (preferably) or WPA2/WPA (sometimes available when WPA2 is not, standalone) or, on older routers, WPA.
Never leave an open WiFi network without a password.
5. If WPS (WiFi Protected Setup) is enabled on your router then disable it.
6. If you live in a high density area where there is a real actual possibility that someone with too much time on their hands might spend it trying to crack the password on your network then consider turning off SSID broadcasting. If you do this then your network name will not automatically show up when you use the "search for available network connections" feature on your devices, but you can manually configure your connection by entering both your SSID and the password rather than just the password.
If you do those few simple things you will have eliminated virtually all "hacks of opportunity" into your router itself or your WiFi network.
Brian AKA Bri the Tech Guy (website in my user profile) - Windows 10 Home, 64-Bit, Version 1809, Build 17763
Travel is fatal to prejudice, bigotry, and narrow-mindedness, and many of our people need it sorely on these accounts. Broad, wholesome, charitable views of men and things cannot be acquired by vegetating in one little corner of the earth all one's lifetime.
~ Mark Twain