Free Wi-fi Passwords is an excellent security tool for your phone that will help you to improve your home or office router security agains wifi hacker attacks.
Just open up this app and choose a security type between weep spa was or wpa2 after this you just need to click over the gen button below. Then 3 long alphanumeric random passwords will be generated. The last step is set it to your wifi router. Don't worry it's easy and there are many tutorials.
If you want longer passwords you can press the unlock button for the in-app purchase.
Why this method works? because as longer and complicated is a wi-fi password harder to hack with a brute force hacking tool.