Understand that for both beginning investors and seasoned stock market pros, it's impossible to always buy and sell the best stocks at exactly the right time. But also understand that you don't have to be right every time to make money. You just need to learn some basic rules for how to identify the best stocks to watch, the ideal time to buy them, and when to sell stocks to lock in your profits or quickly cut any losses.
Use limit orders: Always use limit orders rather than market orders, when trading penny stocks. The very act of buying or selling shares in a company that is thinly traded can result in the price moving due to your trade. In other words, your buy might cause the shares to temporarily and artificially increase, then drop back down as soon as your purchase has been filled.

The most feared words on any stock exchange are margin call. A margin call is made when a position is losing money and more money is required by the broker to keep the trade open. If and when a stock ticker moves quickly, there can be people whose borrowing levels literally bankrupt them as things get worse ... fast. Volatility can be either a blessing or a curse, but if you have too much leverage, it can break a trader.
What would make me sell: Sometimes there are good reasons to split up. For this part of your journal, compose an investing prenup that spells out what would drive you to sell the stock. We’re not talking about stock price movement, especially not short term, but fundamental changes to the business that affect its ability to grow over the long term. Some examples: The company loses a major customer, the CEO’s successor starts taking the business in a different direction, a major viable competitor emerges, or your investing thesis doesn’t pan out after a reasonable period of time.