There ARE no websites that teach "EVERYTHING" about firearms- I have been a student of firearms for over 50 years, and I am still learning.
Firearms are an incredibly broad topic- I would suggest you narrow down your interests a lot, and find some specific aspect of firearms you would like to study. That might be the history of firearms, rifle target shooting, hunting, skeet shooting, etc.
Their are no websites that can prove pyrokinesis is real. However, some websites do teach how to use the technique, these websites are in the related links section.
There are several websites which deal in vintage firearms. Some of the most popular are Gun Broker, Vintage Weaponry and Antique Arms. These websites both buy and sell firearms.
Webkinz and Poptropica are some good sites
Take This Lollipop. ITS CREEPY!
Try www.howtodrawmanga.com , www.animecubed.com and animeworld.com
Yes, there are online classes that teach specifically in defensive driving. Some websites are www.idrivesafely.com, www.trafficschoolonline.com, and www.defensivedrivingus.com
Some learning websites for kids are www.learningtree.com, and www.eagerlearning.com. There are a multitude of websites that are available to help young children learn things online.
The best way to learn about cars is to take some glasses and read a lot of books. No one person will possess enough information to teach you everything.
There are many websites that teach people how to disable the HomeGroup function on Windows 8. Some examples of websites are TechRepublic and How-To Geek.
You might try eBay or post in the Want to Buy sections of some of the firearms related websites.
There are many online schools which can help you learn Korean. Some examples include, but are not limited to: www.learn-korean.net/ and www.elanguageschool.net/korean
There is a typing program called Mavis Beacon teaches typing you may want to use or learntotype.com