Your internet has become slow and you don't understand why? 78% of users don't even realize that their network is being used by strangers.
Open the router settings (the address is usually written on the back panel) and look at the list of connected devices.
If you see unfamiliar names like "iPhone13" or "AndroidTV", immediately change your password to a complex combination of letters, numbers, and symbols.

Hackers can hack this too
Just in case, enable the "guest network" function. If someone can connect to your network, they will not have access to your files.
And to be completely safe, set a Wi-Fi schedule - for example, turn it off from 11:00 p.m. to 6:00 a.m.
There are other ways
Update your router firmware - older versions contain vulnerabilities.
Go to the manufacturer's website, download the latest version and install it through the control panel.
And if the router is provided by the provider, change it to your own - rented models often have "back doors" for technical support.
What to do if your neighbors use your Wi-Fi for illegal activities? It's simple: the traffic comes from your IP address, and you will receive claims.
Enable WPA3 encryption and hide the network name (SSID) so that it cannot be found in the list of available ones. For reliability, enable MAC address filtering, allowing access only to your devices.
And the last life hack: if your router is old, buy a repeater.
It will strengthen the signal in your apartment, but will not reach your neighbors.
It is also often recommended to wrap the antennas in foil to direct the waves in the right direction. However, skeptics do not believe that this can somehow affect the situation.