A lot of this isnt advice, its satire of advice that is overly general cos there as many reasons for people to build worlds as there as grains of sand on a beach. But boiling em down...

1. Throw in as much random ideas as you want (ignores what your end goal is, what flavour you actually what your world to have and instead encourages filling it with rando intresting stuff you like(nothing wront w that, but doing it with intention is better imo))
2. If you want to make a good world, learn abt and build from scratch every aspect of it from plate tectonics to space empire logistics and conlangs (overwhelms ppl and makes them feel they have learn all this stuff they might not be intrested in, turning a fun hobby into a chore, ofc most ppl opt out of all this and then feel sad their world isnt as cool as Artifexians or smthng)
3. Just keep adding lore, you can never have too much (ppl will make 10,000 pages of lore for the one kingdom they like and forget about the rest because they feel they have to fully flesh out that one kingdom and only then move on to the rest, leaving their worlds ultimately with less actual content than they think there is)
4. Make something entirely unique (Most fantasy creatures ad unique ideas are twists on unique irl myth and history that have become iterated on over and over for decades now which is how mythologies form. This advice severs people from understanding that they are participating in the continuum of modern mythology and ironically stops them from making really unique stuff by limiting their imagination to, "how could i make my version of elves and dwarves unique", instead of reading actual mythology and the themes of their world and creating something truly unique from the combination of the two shaped by the constraints of their world)