"What's a router?" A router is what you would attach to your Internet modem so you can plug more computers/devices to the Internet using ethernet cables. "But why would I want to attach a cable for Internet when I can just use Wifi?" A physical cable will give you a faster & more stable connection to the Internet. For gaming & video streaming, Ethernet cables are usually the best options. WiFi is meant for mobile devices, such as phones & tablets that are constantly moved to different areas of the home.
Router & power adapter only, no box or manual
$10
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Cisco Linksys E3200
Dual-Band Wireless N Gigabit Router
For more info, visit:
https://www.cnet.com/reviews/linksys-e3200-high-performance-dual-band-n-router-review/
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NetGear N300 WNR2000 v2
Wireless N Dual Band Router
For more info, visit:
https://www.amazon.com/NETGEAR-N300-Wireless-N-Router/dp/B00SWKM4M2/ref=pd_lpo_2
https://youtu.be/FQzwb-PUjfM