Here are some great and helpful articles that covers the basics of Investment and Online trading

• About Online Trading
• Choosing a Broker
• Determine Your Risk Tolerance
• Determining Where You Will Invest
• Different Types of Bonds
• Different Types of Investments
• Different Types of Stock
• Getting Your Feet Wet – Begin Investing
• How Much Money Should You Invest?
• How to Know When to Sell Your Stocks
• Investing Basics – What Are Your Investment Goals
• Investing for Retirement
• Investing Mistakes to Avoid
• Investment Strategy
• Long Term Investments for the Future
• The Importance of Diversification
• Understanding Bonds
• Why You Should Invest

In the real world, big corporations are investing part of their profits to gain another source of income. Most of their incomes are from different business leads that was collected from surveys, websites and point of sales, when these leads becomes successful it will turn into something more productive called sales leads