how to know if your Wi-Fi is breached by someone

We are all using Wi-Fi and they are seemingly everywhere. We share our Wi-Fi passwords with friends and contacts who visit us and want to connect, but do not have the time to change the password and it's struck forever. Most of these shared passwords are innocuous and fine. But that's not all. Your Wi-Fi can be technically breached by intruders and used for nefarious reasons. Therefore, it's interesting and important to keep track of who's using your Wi-Fi, or at least know that someone is misusing your Wifi. Here is some ways you can spot that.