Understand the risks associated with the stocks you are investing in. In the company’s 10-K, there is an extensive section that talks about the company’s risks. You also need to understand your own tolerance for risk. If you invest in a stock that is highly volatile and you are not comfortable with market fluctuation, owning the investment will make you anxious and more likely to sell when it does not make sense strategically.
Most Wall Street pundits will tell you it's impossible to time the stock market. While it's unrealistic to think you'll get in at the very bottom and out at the very top of a market cycle, there are ways to spot major changes in market trends as they emerge. And by spotting those changes, you can position yourself to capture solid profits in a new market uptrend and keep the bulk of those gains when the market eventually enters a downturn.
Assess how much capital you're willing to risk on each trade. Many successful day traders risk less than 1% to 2% of their account per trade. If you have a $40,000 trading account and are willing to risk 0.5% of your capital on each trade, your maximum loss per trade is $200 (0.005 x $40,000). Set aside a surplus amount of funds you can trade with and you're prepared to lose. Remember, it may or may not happen.
Finding the best stocks to buy and watch starts with knowing what a big market winner looks like before it takes off. As noted above, IBD's study of the top-performing stocks in each market cycle since the 1880s has identified the seven telltale traits of market winners. Your goal is to find stocks that are displaying those same traits right now. Traits like explosive earnings and sales growth, a strong return on equity, a fast-growing and industry-leading product or service and strong demand among mutual fund managers.
Beware of confirmation bias: With penny stocks, beware of confirmation bias: the tendency to interpret information in a way that that conforms to your preexisting beliefs. This is something that afflicts nearly every human being and most new investors (or rookie poker players). Seeing what you want to see (albeit usually subconsciously) can be incredibly costly.

His book is a big beast at more than 600 pages and will need to be committed to, but it offers some fantastic insights into how to invest safely and profitably for the long-term and how to make your money work harder. Having interviewed all these legendary traders and investors, the book contains some excellent insights into asset allocation and portfolio planning that almost everyone should gain some benefit from reading.
Astute readers will realise that the above guidance is mainly taking different angles to help prepare for and guide decision making by the investor. The ability to confidently make decisions is vital for investment profits and long-term success. This pdf about the decision making models of Charlie Munger (business partner to Warren Buffett at Berkshire Hathaway - both are certified investment immortals) is almost certain to prove helpful.
It can be helpful to start with paper trading, or simulated trading that allows you to practice without risking actual money. By keeping track of pretend money, and making imaginary trades, you'll learn what tactics work and what sorts of penny stocks provide you with the greatest profits. If you lose on your trades, you don't lose cash in real life, and ideally, you'll learn some things that you might be doing wrong.

Buy “the basket”: Can’t decide which of the companies in a particular industry will be the long-term winner? Buy ’em all! Buying a basket of stocks takes the pressure off picking “the one.” Having a stake in all the players that pass muster in your analysis means you won’t miss out if one takes off, and you can use gains from that winner to offset any losses. This strategy will also help you identify which company is “the one” so you can double down on your position if desired.