Sometimes, it can be hard to figure out that your WiFi network is hacked, but there are some symptoms that can indicate that something goes wrong with your network:

1. Low speed. One of the most obvious signs is a slow internet connection as the hijacker may be using a large amount of bandwidth. 
2. Connection instability. You may notice that your devices are constantly disconnecting and it takes longer to reconnect to the WiFi network. 
3. Suspicious traffic reports. You can request a traffic report from your ISP to check out the amount of traffic sent from your network. If it is noticeably bigger than your network is supposedly used not only by you.

The process for changing the default settings on a router may vary depending on the model of your router. But there are some general steps that may suit various types of routers:

1. Connect your PC to your router using an Ethernet cable or via WiFi.
2. Enter your router's IP address in the address bar of a web browser. The IP address is usually listed in your router's documentation, or you can try using the default addresses: 192.168.1.1 or 192.168.0.1.
3. Enter your router's username and password when prompted. If you haven't changed the default login credentials, they should be listed in your router's documentation. If you have changed them and can't remember what they are, you may need to reset your router to its factory settings.
4. Once you've logged in, you need to navigate to your router's settings menu. Here you can change a variety of settings, such as your network name and password, your IP address, your DNS settings, and more.
5. When you're finished making changes, save your settings before logging out of the router's interface.

Wi-Fi hijacking is dangerous because it can allow hackers to gain unauthorized access to your wireless network and intercept sensitive information. Once the attacker gains access to the WiFi network, he can perform various malicious actions, such as stealing sensitive information, injecting malware, or installing backdoors that allow them to maintain access to the network in the future. As a result, your identity can be stolen, your finances can be lost, and your reputation can be ruined.  

Wi-Fi hijacking can be made through various methods and it is crucial to understand how it works in order to protect from it. Here are the main methods of how your WiFi network can b hacked:

• Using router vulnerabilities: Hackers can use vulnerabilities in your router's firmware, WiFi encryption protocols, or operating system to gain access to your WiFi network. These exposures can be used to bypass security measures and access your network without authorization.
• Brute force attacks: In this case, specialized software tools are used to crack your WiFi password. The weaker your password is, the lesser time it will take a hacker to crack it.
• Man-in-the-middle attacks: In this type of attack, the hacker intercepts the communication between the WiFi network and the device and modifies the data being transmitted. Usually, he redirects the traffic to a fake network under his control.
• Fake WiFi access points: Hackers can set up rogue access points that imitate legitimate WiFi networks. Trusting users may connect to these fake networks, which allows the attacker to intercept their data or gain access to their device.

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