If you have walls open (such as in an unfinished house), implement Cat-6 cables and wire your home with ethernet before it gets logistically difficult to do so. Wired is always faster than Wireless from the same source.
Hard-wiring your computer with ethernet is the fastest and most reliable way to connect to the internet. But with Wi-Fi being so prevalent, and included in every modern computer, it can be difficult to get your computer to use that wired connection. Here's how to prioritize the wired connection over wireless in Windows 10:
Jonathan has DSL internet, and is wondering if there's an advantage to hard wiring his Roku rather than having it wireless. Scott says yes, hard wire is better because of the possibility for interference in the Wi-Fi spectrum. David says that if he's not having video dropouts, hard wiring won't improve the video quality. It'll just give him a more consistent stream. He also has an A/V receiver wired to his speakers.