While there is no need to inundate beginners with technical details, there is a good cause for at least listing some citations for the claims this article is making, as well as resources for further exploration and learning. There are many build guides out there, but perhaps a beginner wouldn't know what words to use to search for them, so here are a few:
Newegg's video series
https/www.youtube.com/watch?v=lPIXAtNGGCw
Tom's Hardware's
http/www.tomshardware.com/faq/id-1657114/step-step-guide-building.html
A decent power supply calculator
http/www.extreme.outervision.com/psucalculatorlite.jsp
Also,
To a beginner, the power supply section seems to suggest that the actual units differentiate based on whether they contain bronze, silver, gold, or platinum, when those are just the names given to the different levels of energy efficiency certification.
In addition, it would be worth noting that a large downside to playing on a PC has just been removed because the Xbox One and PS4 will both, for the first time, be using the same computer architecture as PCs, which at least means that PC ports will be of a higher quality and might even mean that more games get ported!