Trump University?

Yep, there is none. Have a diversified portfolio of stock and bond index funds for the long term. The longer the term and the younger you are, the more in stocks. The boggleheads site may be a good resource. Picking stocks, you'll likely get creamed in the long run.

If those sites could predict the market, they'd get out of the news/website business and just trade stocks all time. It would be much more lucrative.

It's like those guys on infomercials who show how they made millions in real estate. If they're so good at it, why are they wasting their time hawking $400 books/courses in buying real estate?

None. There is no one who can predict the future.

If I wanted financial advice, I might go with boggle heads.com.

I am thinking to buy/sell stock myself. Besides learning the basics (books, research of the stocks fundamentals, etc), which website of stock analysis (such forecast, recommendations to buy/hold/sell, which stock is recommended to buy, etc) is most reliable, Yahoo finance, CNN money, Nasdaq, Morningstar, Zack......?