This is a fairly common question, and there isn't a One True Answer.
These are the most common techniques:
The Raspberry Pi can be used as a bridged wireless access point within an existing ethernet network. This will extend the network to wireless computers and devices.
If you wish to create a wireless network that could function stand-alone, consider instead setting up a routed access point.
+- RPi -------+
+---+ Bridge |
This is not a fix, but a workaround for repositories not on HTTPS yet. Use with caution.
[ERROR] (...) Could not transfer artifact no.whatever:whatever-client:pom:3.1 from/to maven-default-http-blocker (http://0.0.0.0/): Blocked mirror for repositories: [releases (http://unportected.com/nexus/content/repositories/releases, defaul)] -> [Help 1]