I'll admit I'm not very good at geography. I'm not talking about locating countries here. I'm talking about the consequences certain terrain will have on climate, fauna and flora. At most I can describe it for my region, but forget the rest of the world.
Yet geography, when you build a fantasy world, is an essential part of your work. You don't have to know the details of what's what, but it's important to understand that tall mountains can keep the humidity near the shore and create a dry climate on the other side. It's good to know where are earthquakes more frequent and why.
The type of climate a kingdom has to contend with influences who they are. It changes their clothing habits. It gives them a different set of rites and rituals. It'll put them in contact with another type of vegetation and animals.
If you build your fantasy world from scratch, get to know your geography. Make it as much a part of the world as the rest. Research the topic to create a plausible map. This might tell you what kingdom has what resources, which in turn hints at who they'll want to ally with.
And even if you're writing with an Earth city, do your research. There are slight differences from one city to the other, even when they're only a few hours apart. Climate influences every aspect of our lives. Don't forget it as you work on your setting.
Love your geography. Get acquainted with your climate. You'll have that many more details to make your world come alive.