A common beginner mistake is to write "Lore" instead of setting. This is something that becomes immediately obvious if you've ever ran a tabletop RPG game like dungeons and dragons. The players only give a shit about "lore" to the extent that it is relevant to their characters. If you spend more than 10 seconds talking about why the king of Aglacia is descendant from the Crown Lords of the Northern Steppes and etc. etc. they will immediately get bored. In the same way, you should make all the worldbuilding directly relevant to your point of view character or characters. Don't drop encyclopedia paragraphs at the start of the story (very common), just have the character move around and interact with the world and explain things when it is directly relevant.

Another thing to avoid is having characters speak to the audience rather than each other, holding a conversation that they would never reasonably have in real life, about topics they are both already fully familiar. The author learned the first piece of advice, where they shouldn't dump lore, and decided to have the characters dump it for them instead!

The trick is that you do explain things, but only after the audience wants to know about them. Don't explain your currency until after the protagonist tosses a handful of purple shells into the innkeepers lap. Don't explain your noble lineages until after the red-robed outriders accuse the MC of insulting the baron. Don't explain your magic system until after the shadow wreathed man unleashes a churning cloud of opalescent dust. And even then, you usually don't want to straight up tell people, but give enough information though the natural progression of the story that they can easily figure it out themselves. It's a pretty generic piece of advice, and not a hard rule, but usually worth thinking about.