Places where not to put a WiFi router are in places that are surrounded by obstructions, near a microwave, low to the ground or locations that are enclosed.
Also avoid placing your WiFi router in cabinets, closets or behind furniture, and don't place the WiFi router on the floor or in a basement and keep the WiFi router away from any sources of interference like cordless phones, large metal objects and of course microwaves.
For best internet performance, you want to place your WiFi router so that it's located centrally, and unobstructed and also in close proximity to the WiFi stations.
WiFi does go through walls although the WiFi signal can be weaker when going through walls than it would be if it had gone through windows.
When WiFi signals pass through walls the WiFi signal will be attenuated as it passes through the walls or ceiling, although it will continue outward.
Drywall though does not reflect much of the WiFi signal although WiFi signals can also travel through drywall.
WiFi signals can also go through floors, although the WiFi signals are reduced by obstacles.
Material of the floors, like insulation, subfloor joists, ceiling materials, etc also play a significant role in how much the WiFi signal is weakened.
Materials that are denser like brick, concrete and metal will also cause greater loss of WiFi signal strengthen, when compared to lighter materials like drywall, glass wood etc.
Physical obstructions such as walls, doors and even furniture can cause WiFi interference.
Materials such as concrete, metal and plaster can significantly reduce the range of WiFi signals.
The solution is to strategically place internet routers in areas where they can provide optimal coverage.
Wi-Fi internet works by converting digital data into radio waves that are then sent and received by a wireless router and your devices.
The WiFi internet router is physically connected to the internet, and it acts as a central hub, broadcasting a signal that devices with Wi-Fi capabilities can connect to.
Your devices then translate this digital data into radio waves to be able to communicate with your WiFi internet router, which is similar to how a radio works but on a much more complex.