How to use a laptop as a router?

[ChickenCake248]

Well, I am trying to get my laptop to become a wireless router for myself (running standard Windows 10), since my college WiFi/LAN is really annoying, and the only way I can connect my 3DS to the internet is by creating a hotspot with my laptop. I know this is possible, since I downloaded an application that was able to do this. The only problem is that this program is a demo that only allows for half an hour of uptime at a time. Is there a way to create a WiFi access point with my laptop, which is connected to ethernet, without having to pay money for the full program?

[Mark77]

The functionality is built right into Windows 10 if you have a WiFi card that can go into access-point mode.  Just click on "Mobile hotspot", and right-click to set it up.

 

I have it set up there to share my laptop's 4G LTE connection, but I know it will share a wired Ethernet connection as well.