What are the best websites for learning forex and stock trading?

Best is a matter of opinion, and arguing is all part of the game, and who is right changes constantly.

For Forex, the ones that cost money.
Forex is VERY risky. You really need to make it a full time profession, and know everything that is going on in the world, 24 hours a day.

For stocks, read some advice here and there, but stay away from puts, calls, options, and buying on margin. So you can just jump right in with a small amount of money. and watch a lot of CNBC and Bloomberg. Online, Marketwatch might be a good start.
There are so many constantly changing variables that it isn't something you can just sit down and study, and be ready.
There are also vast differences among countless very knowledgeable investors, so you have to decide on your own.
Warren Buffet is a billionaire by buying stock in companies he studies and likes, and he stays in for the long haul, very different from the people who are buying and selling constantly (and you need to know the tax consequences).

Here are few good web sites to learn about Forex & stock trading:

- Investopedia.com
- BabyPips.com
- Finance.Yahoo.com
- FinproTrading.com

Besides these web sites, other options to learn Forex & stock trading could be:

- Reading books
- Reading articles
- Doing research & learning about the greatest investors
- Buying your first stock or practicing trade
- Attending seminars and trading workshops