Useful Resources for Worldbuilding

This page lists and details some of the more useful resources to improve your worldbuilding experience.

Essential Resources

Paint .Net
Paint .Net is the easiest to use/free version of Photoshop on the market and is an excellent tool in many matters because it can serve so many purposes from flag creation to map creation.
Wikipedia
Wikipedia is a great source in general at finding information on just about anything. It will be mentioned specifically in some fields but overall, you can find information on most things essential for worldbuilding on Wikipedia and build from there.

Coat of Arms and Flags

Flags

Vexillology
Unironically, one of the best and easiest ways to create flags is to borrow preexisting flags from either Wikipedia or Google images. You can be lazy and just use the flags or you can adapt them to your own means. An example is using a traditional Cross of Burgundy and recoloring it to your desires in Paint. The link above is a great starting place into understand what vexillology is and the related pages are also great resources.
Flag-Creator
Not the greatest site for Flag Creation but it could be what you are looking for because of how simple it is. Good at just creating base designs for you to build on with other sites.
Flagmaker-Print
The best site when it comes to creating flags, not because it has a bunch of special elements to it but because you can import your own pngs to it and easily line them up using the snapping mechanism, so your flag is not off balance. Highly recommend for everyone, especially those who don't like moving something in Paint .Net forever until it is perfect. This site also has some nice base designs and an easy-to-use interface.

Coat of Arms

WappenWiki
The quintessential site for all of your needs for Coat of Arms. This site has thousands of real coat of arms from across Europe and the New World at your disposal, whether you chose to use them outright, combine them into other Coat of Arms or even make a flag from them; WappenWiki is a goldmine. Furthermore, their resources are excellent and allow you to understand things better. The only real flaw is that the page is slow to load sometimes but it is highly recommended.
WikiCommons
A basic, simple but useful source for finding Coat of Arms elements to use for your Coat of Arms. Everything comes in PNG so it makes your task in Paint easier. Easy to access and understand.
DrawShield
If Wappen is the quintessential site, this is the most Indepth and unique site at your disposal. It is extremely complex and hard to use but the site also has plenty of tutorials on it to help you. Furthermore, it is an excellent source in learning about Coat of Arms as well. There is no better site on the internet when it comes to creating good coat of arms and should you learn how to use its complex mechanics, you will create something truly great.

Climate and Geology

Wind and Currents: https://rentry.org/rvqz9
Weather Systems: https://rentry.org/nnvbx
Climate Analysis: https://rentry.org/vtwbg-climate
Tectonic analysis: https://rentry.org/dmkyc
Geologic provinces: https://rentry.org/ztaf99

Feel Free to ask a ClimateAnon in particular as they are experts in helping you figure this out and save you a lot of problems!

Others:
Where Metals Are Found On Fantasy Worlds!
A nice youtube video helping you understand geology and it adds on to the existing
Geodiode
Another nice introduction source into the climates found on vitubia that can provide you with a lot of essential information
Köppen climate classification
As you might have guessed, Wikipedia is a great place to find stuff on climate and geology. In particular, regarding the Köppen climate classification as it will give you the essential information and point you towards looking at IRL regions or nations that can be used to transfer in world. Wikipedia furthermore helps a lot when it comes to minerals as well, and even explain what some resources are even used for.
Holdridge Life Zones
Another IRL climate and geology classification scheme that can prove to be useful, as one anon said

...especially if you intend to use supernatural means to adjust factors contributing to the biome and want to know how the biome will be affected.

Other Resources

https://pastebin.com/JNnj79S5
Has a lot of resources already in this that can help, worth checking out.
https://sites.ualberta.ca/~urban/Projects/English/Content/Motif_Quick_Index.htm
Can be useful for people who need some inspirations on folklore and myths
https://world-crops.com/
Has basically anything you need for your agriculture means.