This is an excellent learning experience and one that is vital to the long-term profitability of anyone in the stock market. To get the real experience, purchase some graph paper and chart the stock price movements each day by hand. Learn to compare this with the overall movements of the equity market or index and a whole new world of investment and money will begin to open up to you!
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.