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Remember that free stock picks usually exist because of the vested interests of the company or the promoter. There are some exceptions, such as in the case of top book publishers, like John Wiley & Sons, who produce works like, "Penny Stocks for Dummies." Their exhaustive vetting process alone is usually thorough enough to provide you with some serious confidence in who they choose.
However, it might be best to not become too much of a market "expert". Some of the most famous and successful investors of all time, such as Peter Lynch, the famed manager of the huge Fidelity Magellan fund. He suggested that looking for clues in normal life is a great way to find opportunities. Lynch used to closely follow the shopping habits of his wife to see what brands people were buying. He believed that most people working professionally on the NYSE lived in a bubble.
News events and earnings reports can change the perceived value of a company. Because the stock market functions as an auction, prices sometimes need to adapt for a trade to occur. When there are more sellers than buyers, the price will go down. Alternately, a stock that has more who want to buy than sell will experience a price increase. Buyers and sellers can be individuals, corporations, asset management companies, or others. Price fluctuations can be dramatic in just one day.
Why I’m buying: Spell out what you find attractive about the company and the opportunity you see for the future. What are your expectations? What metrics matter most and what milestones will you use to judge the company’s progress? Catalog the potential pitfalls and mark which ones would be game-changers and which would be signs of a temporary setback.