You can open up a savings account at any bank. Most banks now have ATM cards which allow you to withdraw and deposit money at a machine, rather than with a person called a Teller. There are ways to invest your money that also help other people or causes. There are companies that make special efforts to sell safe products, help the envirnoment, or give a percentage of earnings to charities. There are also special funds that invest money to help socially responsible causes.
Stock is ownership of a company.
If the company does well, and the stock price goes up, you benefit. If the company does not do well, then the stock price can fall and you can lose money. The price of one share can cost anywhere from a few cents to thousands of dollars depending on the company. A stockholder can decide what day and at what price to buy a stock and what day or price to sell a stock. The goal is to buy a stock low and sell hight.