I'm not kidding when I say worldbuilding is extremely easy and fun, you can make easily all sorts of new fantasy worlds on like half an hour, follow this guide:
take a rectangle, draw a line through the middle, that's your equator, draw another two lines south and north, those are your tropics, draw another two lines further north (you can see a real world map to guide yourself), those are your arctic/antarctic circles
Draw continents, any shape you want, it's better to combine large soft blobs (like Africa or South America) with coastlines full of peninsulas and islands (like Europe or South Asia). Draw some island chains in between where you feel it's appropiate. Some inland seas like the Mediterranean are good too.
Decide where you will place mountain ranges. In real life, they are where oceanic-continental plates (Andes) or continental-continental plates (Himalayas, Alps), collide. These are very important.
Place rivers, just the most important ones. The places where you place big river systems are gonna be big plains.
Now, the fun part. With your first step, you've already decided where arctic, temperate, and tropical climates are there. You can mark it as letters in your map. Mountain ranges, of course, are colder.
Here's the tricky part: vegetation: vegetation mostly follows precipitation, and precipitation is mostly decided by altitude and distance from the ocean. The interior of your continents should be dry with plains and deserts; the coasts should be rainy with forests and plains. But remember, if you have a mountain range, that's a rain shadow! Picture the wind coming from the ocean with rain, and it should get less rainy when it "clashes" with a mountain range, with the other side a desert.
Deserts are tricky to place, but as a quick cheat, you can place them in your tropic lines. They can even border oceans: see Australia and the Kalahari.
WHEN IN DOUBT, LOOK AT SIMILAR AREAS ON A REAL WORLD VEGETATION/CLIMATE MAP. THIS IS WHY DRAWING THE EQUATOR AND THE TROPICS IS SO IMPORTANT AND SHOULD BE YOUR FIRST STEP ALWAYS.
Now you already have a quick and dirty vegetation map, you're halfway there! Don't worry if there are some doubtful areas, real world geography can be weird.
Now for the REAL fun stuff (if you aren't having fun already, I sure am): making civilizations!
You have to decide center of origins for your domesticated crops and animals. Basically, every early civilization had its own "package" of staple crops and animals that are still used today.
With this, you can decide:
the primary civilizations of your world
roughly how different animals and vegetation are distributed, if you want an Earth-like world (for an quicker method, you can apply the biogeographical realms to your own continents as you wish)
A quick cheat sheet of centers of origin, what they have, and where you can place them:
(this is just a quick thing, do read the article it's so much better)
Middle Eastern: wheat, barley, cows, sheep, goats. Place them in a dry area with lots of rivers (the Fertile Crescent!)
East Asia: rice, soybean, oranges, pigs, horses. Place it in a rainy temperate area bordering the tropics.
Mesoamerica: Corn, beans, pumpkin, chilli, tomato. Place it in a dry area near the tropics.
Andes: Potato, quinoa, llamas. Place it in a mountain range.
Tropical South America: manioc, peanuts, pineapple. In the tropics.
Tropical Asia: Rice, banana, sugar cane, beans. In the tropics, again.
or, just straight up use this fucking map, it's so much better:
You can mix and match the crops, animals, and such as you wish, and you should definitively read the wiki page on center of origins and see some other less known crops.
If you have non-human civilizations, of course they'll have different packages. Carnivore or subterranean civilizations might be very different. But at this point, your imagination should be flying already and I don't have to hold your hand here.
Now, you have a rough map of your world at the dawn of agriculture! Congratulations! Depending on the historical period you're setting your world, you can start to draw countries and civilizations. This is where it gets complicated again. I might have to make a part two... But just with this, you already have a new world to use as you wish.
I'll make a worked example later to show you how easy it is if you don't believe me.
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