These are the two types of PCs that I think will be the aim for those who are reading this guide, any lower and chances are it isn't worth it to build your own, any higher and you already have experience with PC building.
If you are looking at simple office work, image editing, or media streaming (youtube, netflix, spotify, ect.) nothing more than a quad core APU, as there is little need for heavy processing duty, or dedicated graphics. 8GB of memory should be enough, but you should make sure that you have plenty enough storage. I would recommend around 2TB, in a single SSD due to their rapidly decreasing cost
Mid-Range Gaming PCS
If you're not planning to beplying the latest, most demanding tites on the most graphically intense settings, but still want to upgrade from an Xbox One or PS4, this is what you should be loking at. I would reccommend anywhere from a 6 core, to an 10 core CPU, 16-32GB of RAM A dedicated GPU with a minimum of of 4GB of VRAM (video memory), and a 1TB SSD for a boot drive to hold your OS ( Operating System (Windows, MacOS, ect.)) and a 4TB HDD so you'll never run out of storage.
