Super handy tutorial from Pi My Life Up.
A Raspberry Pi wireless access point is a great way to extend the length of your Wi-Fi coverage, and provide an additional access into your network.
In this tutorial, we will show you how to setup a wireless access point, and how to configure the multiple packages that allow users to connect to your access point as if it was a router itself.
You will need to keep in mind that a Wi-Fi dongle most likely won’t be able to handle as much traffic as a normal router. This means you should avoid allowing too many connections to the device to stop it from becoming too overburdened and slow.