Avis is remodeling her home and she wants to wire her home for three computers, security cameras, and her home theater. Leo says that will require a high speed connection with all that video data. It's hard to future proof, but as long as she has the walls open, she should put conduit in. That way, when she needs to upgrade, it's a lot easier to run new cable through it.
Leo advises Cat6 Ethernet for now, which carries 1GBps of data along the network. A 10GB Ethernet connection. Remember, the higher quality the wiring, the more data it can handle. If she can't afford that, Cat5e is good as well.