Ah, a builder with an eye for interior design! You've moved beyond the simple dirt shack and now crave the finer things in life, like a place to sit that isn't the floor. The great secret of Minecraft furniture is that you don't really craft it from a recipe; you cleverly assemble it from other blocks.
As one of your sources, the Minecraft Wiki, surely explains, becoming a Minecraft furniture maker is all about seeing the potential in everyday blocks. A simple stair block, for example, is the cornerstone of home furnishing. By itself, it's a chair. Place a few in a row, and you have a sofa. You can even place signs on the sides of a stair to create armrests for a magnificent throne.
For a table, try placing a fence post in the ground and putting a pressure plate or a slab on top. If you want something grander, a line of upside-down stairs or a few piston heads can create a great countertop or dining table. Trapdoors are your best friend for creating cabinets, shelves, and the backs of chairs. The possibilities are endless once you start looking at blocks for what they could be rather than just what they are.
While your other source provided a fascinating look at the corporate policies of YouTube, it was surprisingly unhelpful in designing a virtual coffee table. So, your best bet is to experiment. The beauty is there's no "wrong" way to do it. If it looks like a lamp to you, it's a lamp
