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How do I check if someone is hacking into my wi fi
I'm not sure anyone can hack into your wifi if they don't know your SSID's and passwords.
Look in your router's user interface pages for something to the effect of "Connected / attached Devices" or "DHCP Clients" and see if there are any MAC addresses indicated for currently connected devices on your network that are unknown to you / can't be accounted for. Look at past connections as well.
You would have to log into your router and check to see what devices are connected. This can be really hit or miss if you are not familiar with what devices normally are connected and it might not show up in a very user friendly format depending on the device and your router. Here are some general tips on running a more secure wifi connection.
1: Use wpa 2 or 3 if supported.
2: disable wpx / easy push to connect, there is a known vulnerability in this.
3: make the passphrase easy for you to remember but something someone might not guess.