While both terms - stock market and stock exchange - are used interchangeably, the latter term is generally a subset of the former. If one says that she trades in the stock market, it means that she buys and sells shares/equities on one (or more) of the stock exchange(s) that are part of the overall stock market. The leading stock exchanges in the U.S. include the New York Stock Exchange (NYSE), Nasdaq, and the Chicago Board Options Exchange (CBOE). These leading national exchanges, along with several other exchanges operating in the country, form the stock market of the U.S.

In most cases, your broker will charge a commission every time that you trade stock, either through buying or selling. Trading fees range from the low end of $2 per trade but can be as high as $10 for some discount brokers. Some brokers charge no trade commissions at all, but they make up for it in other ways. There are no charitable organizations running brokerage services.
You can profit from owning stocks by an increase in prices or quarterly dividend payments. Due to compound interest—which allows your interest to begin earning interest—investments accumulate over time and can yield a solid return. For example, if you make an initial $1,000 investment and add $100 monthly for 20 years, you'd end up with $74,457.50, even though you only contributed $25,000.
Plug Power is an excellent example of the volatility investors may experience when they buy stocks beneath $5 – in the early months of 2020, shares of Plug Power rocketed up over 80%, only to suffer 50% losses shortly thereafter. While speculators may have enjoyed the pop and drop, true investors would be wise to buy and hold Plug, which makes hydrogen fuel cells for commercial vehicles. Plug’s fuel cell shipments have increased dramatically over the last two years, and the company recently announced a partnership that will usher the world’s first fuel cell-powered, zero-emission commercial trucks onto the road. This opens Plug to new business opportunities as companies around the world turn toward clean energy solutions.
Arbitraging can be very lucrative especially with Asian markets (South Korea for example) where cryptocurrencies are exchanged at premium rates, but due to the high volatility of the markets and the congestion on major cryptocurrencies (Bitcoin and Ethereum) it is becoming increasingly difficult to do arbitraging because of potential incurred losses. Add to this the fact that exchanges need a certain amount of confirmations before balances are made available for trading and it makes it quite risky at least for Bitcoin and Ethereum.

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.
Dollar-cost average: This sounds complicated, but it’s not. Dollar-cost averaging means investing a set amount of money at regular intervals, such as once per week or month. That set amount buys more shares when the stock price goes down and fewer shares when it rises, but overall, it evens out the average price you pay. Some online brokerage firms let investors set up an automated investing schedule.
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