#1 Set Strong Password
First of all, open your router setting page by your default gateway of your network and then create a unique or different password for your router so that nobody else can use your router setting and access your network.
#2 Change Network SSID
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You can change your network SSID name as every router comes with a default name i.e “default” you can do this by going to a wireless basic setting page in your router’s setting and then rename it.
#3 Network Encryption
The most important thing, enable network encryption as many of ours used to use no encryption this is not a good habit, always set a network encryption to your router in order to secure your network.
#4 Filter Mac Addresses
You can filter your MAC address to do this, first of all, make a list of all hardware devices that you want to connect and get their mac address and add them to mac address filtering in your router administration page you can get the mac address of any devices under the settings of their network.
#5 Wifi Signal Range
If your wifi signal is very much strong and you use wifi only in a short area then you should reduce your wifi signal range of your router. So to do so change the mode of your router to 802.11g in place of 802.11n or 802.11b.