There are many ways to know “who is using your WiFi or how many devices are connected to your WiFi“. (For this, allow only selected devices to connect your WiFi is the best method) But again, it is not a good solution because it also affects the signal strength in your home. For this situation, you can reduce the WiFi signal strength. Also, your friendly neighbor may again ask for WiFi password. Because you need to enter the new WiFi password on all your devices. But, it is not a permanent and best solution. Many people change their WiFi password to kick people off from their WiFi network.
But, when you open any website then the internet speed sucks. Because sometimes your neighbor may be watching the videos on YouTube using your WiFi.
There are many reasons to kick people off your WiFi. Many people feel bad when someone uses their WiFi with or without their permission. If you want to block the someone from your WiFi then, here is the complete guide on “ How to kick someone off your WiFi“.