We all know someone who has “tried” investing in the stock market, lost a lot of money, and denounced it as a scam. The truth is that the stock market is not a scam; it is an incredible wealth-building tool. Most people who lose money in stocks do so because they get spooked by a dip in the market and then panic. Fearing that they will lose all of their investment, they hastily sell their shares, often at a loss. This should not be the case. Investors must keep in mind that over the long run, the stock market tends to increase in value, so they should think twice before selling their investments in a panic.
When you are choosing an online stock broker you have to think about your immediate needs as an investor. Are you a beginner? Maybe you need a broker that has great educational material about the stock market. Do you only have a small amount of money you can put aside to invest? Some online brokers allow for small minimum deposits which can be a great option for those with limited funds. Are you always on the go and in need of a robust mobile platform? Some online brokers have incredible mobile apps delivering nearly all the features that their desktop counterparts do.
Interactive Brokers (IBKR) earns this award due to its wealth of tools for sophisticated investors and its wide pool of assets and markets. The firm makes a point of connecting to as many electronic exchanges as possible. You can trade equities, options, and futures around the world and around the clock. Interactive Brokers’ order execution engine stays on top of changes in market conditions to re-route all or parts of your order to achieve optimal execution, attain price improvement, and maximize any possible rebate. The order routing algorithms seek out a speedy execution and can access hidden institutional order flows (dark pools) to execute large block orders. The wide array of order types include a variety of algorithms as well as conditional orders such as one-cancels-another and one-triggers-another. You can also set up conditional orders based on price, volume, daily P&L, margin cushion, number of shortable shares available, rebate available from the trading venue, and other factors.
Because of the web today, all online brokers invest heavily into account security. SSL websites (look for “https” at the beginning any URL) are used by most brokers and some are now even offering two-factor authentication (using your phone to confirm a code before logging in). Just like shopping online and choosing a trustworthy website to purchase from, the best bet is to choose a well-known, established broker for your portfolio.
Traditional full-service stockbrokers do more than assist with the buying and selling of stocks or bonds. They often offer a wide array of services and products, including financial and retirement planning, investing and tax advice and regular portfolio updates. But they can charge substantial fees and transaction costs that can erode long-term investment gains.
The Intelligent Investor by Ben Graham ought to be required reading for every private investor. While the innovations he brought to stock analysis have long been outdated and the red flags he used to watch out for in a company's accounts are now regulated against by the SEC, many of his insights about thinking about investment still stand. For example, his description of Mr Market is still an excellent way of understanding how a crowd moves with the daily news.
The commission structure for options trades tends to be more complicated than its equivalent for stock trades. Until the commission cuts that swept the industry in the fall of 2019, most brokers charged a fee for each leg of an options spread, plus a commission per contract being traded. The per-leg fees, which made 2- and 4-legged spreads expensive, have been eliminated for the most part. We are seeing some brokers place caps on commissions charged for certain trading scenarios. 
This brokerage is not good for passive investors with few trades per year or a large balance. The account requires a hefty $100,000 minimum balance or $10 in commissions per month to avoid an activity fee. The activity fee is the difference between your trading commissions and $10 per month to total a $10 minimum monthly charge. The account charges a higher $20 minimum if you don’t keep at least $2,000 in equities in the account.
If investing in single stocks may be too risky for you, consider investing in good growth stock mutual funds. Mutual funds are a simple, even boring, investment plan, yet they work well for most people. Of course, all investing requires a degree of risk; there really is no sure thing. But mutual funds are a great balance of reasonable risk and excellent returns. They have built-in diversification that will keep you from putting all your eggs in one basket.

The best way to practice: With a stock market simulator or paper-trading account. Many brokers offer these virtual trading platforms, and they essentially allow you to play the stock market with Monopoly money. Not only do you get to familiarize yourself with trading platforms and how they work, but you also get to test various trading strategies without losing real money. The link above has a list of brokers that offer these play platforms.
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