TD Ameritrade offers two best-in-class platforms, designed for two different types of investors. Both platforms are free to use for any investor with a TD Ameritrade account. The web-based Trade Architect, though often in the shadow of thinkorswim, is streamlined and easy to use. It will appeal to beginning investors or anyone who prefers a simplified educational interface. Its tab-based navigation lets users flip between trading tools and account overview, plus charts, stock screeners, heat maps, and more.
If you’re an active, high-volume trader who dabbles in all kinds of assets, Interactive Brokers is a great option, since you can trade just about anything without losing $5 to $7 on every transaction. The platform interface isn’t nearly as user-friendly as Robinhood’s, nor as intuitive as TD Ameritrade’s; however, if you’re the kind of investor who’d benefit the most from Interactive Brokers (i.e., an experienced one), you’ll know your way around a candlestick chart already.
When you've been approved for margin stock trading, you're also eligible to short stock. Almost every successful stock trader has shorted stock at one time or another. When you short stock, you make money when the company's shares fall—or, even better yet, when they crash. The problem is that you can expose yourself to unlimited liability when you do this. 

E*TRADE credits and offers may be subject to U.S. withholding taxes and reporting at retail value. Taxes related to these credits and offers are the customer’s responsibility. Offer valid for one new E*TRADE Securities non-retirement brokerage account opened by 12/31/2019 and funded within 60 days of account opening with $10,000 or more. Cash credits for eligible deposits or transfers of new funds or securities from accounts outside of E*TRADE will be made as follows: $1,000,000 or more will receive $2,500; $500,000–$999,999 will receive $1,200; $250,000–$499,999 will receive $600; $100,000–$249,999 will receive $300; $25,000–$99,999 will receive $200. New funds or securities must: be deposited or transferred within 60 days of enrollment in offer, be from accounts outside of E*TRADE, and remain in the account (minus any trading losses) for a minimum of six months or the credit may be surrendered. The credit will appear in your account within one week of the close of the 60-day window. Multiple deposits made to eligible accounts will be aggregated and will receive a credit on a pro-rata basis once the new account has been funded with at least $10,000. An account funded within 60 days of account open, with a minimum deposit of $10,000 will receive up to 500 commission-free stock and options trades executed within 60 days of the deposited funds being made available for investment in the new account (excluding options contract fees). You will pay $6.95 for your first 29 stock or options trades (plus 75¢ per options contract) and $4.95 thereafter up to 500 stock or options trades (plus 50¢ per options contract). Your account will be credited for trades within a week of the executed trade, after paying the applicable commission charge. You will not receive cash compensation for any unused free trade commissions. Excludes current E*TRADE Financial Corporation associates, non-U.S. residents, and any jurisdiction where this offer is not valid. This offer is not valid for retirement or E*TRADE Bank accounts. One promotion per customer. E*TRADE Securities reserves the right to terminate this offer at any time. Must be enrolled by December 31, 2019, the offer expiration date.
At $4.95 per trade, with no inactivity charge and a $50 full outgoing transfer fee, Ally Invest’s fee structure is about as low as you'll find. Even though a rash of brokers dropped their commissions in 2017 to be competitive with Ally Invest’s $4.95 flat rate, Ally keeps its edge with a zero account minimum and enticing discount for active investors — equity trades drop to $3.95 for users with 30-plus trades each quarter or a balance of $100,000.
A mentor could be a family member, a friend, a past or current professor, co-worker, or any individual that has a fundamental understanding of the stock market. A good mentor is willing to answer questions, provide help, recommend useful resources, and keep spirits up when the market gets tough. All successful investors of the past and present have had mentors during their early days.

Overall commission costs can also be affected by new customer promotions. Brokers may give you a chunk of free trades based on your deposit amount. If your deposit gets you a substantial number of free trades, that can write off otherwise higher per-commission costs. Ally Invest offers small incentives for deposits as low as $500. Fidelity Investments, meanwhile, has a higher barrier for entry — it takes a $50,000 deposit, but then you'll get 300 free trades.
How much money should I invest in stocks? If you’re investing through funds — have we mentioned this is our preference? — you can allocate a fairly large portion of your portfolio toward stock funds, especially if you have a long time horizon. A 30-year-old investing for retirement might have 80% of his or her portfolio in stock funds; the rest would be in bond funds. Individual stocks are another story. We’d recommend keeping these to 10% or less of your investment portfolio.
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