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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.
Online discount brokers: This label is generally given to the companies you see on the list here. While discount brokers are increasingly offering "extras" like research on stocks and funds, they primarily exist to help you place orders to buy investments at a very low cost. Many investors don't need the hand-holding of a full-service broker, and would prefer to save money by paying no commission for online stock trades. That way they ensure more of their money goes toward their investment portfolio, not paying for frills.
While it doesn’t offer as much for beginner traders and new traders, you could host a family office or business portfolio on TradeStation with no problems. In fact, its tools are so good it sells many of them for a fee to professional investors with accounts at other brokers. With an active account at TradeStation, you get those tools for free. Just beware the minimum $2,000 balance or five trades per year to avoid a $95 annual account fee.
Some trading platforms may be agnostic to a specific intermediary or broker, while other trading platforms are only available when working with a particular intermediary or broker. As a result, investors should also consider the reputation of the intermediary or broker before committing to a specific trading platform to execute trades and manage their accounts.
A demo account is a great way for beginners to practice trading and test a broker or trading platform without using real money. A demo account is funded with simulated money, so you can try out the broker’s platform features and get familiar with acting on the markets. A warning though – even the best practice platform can’t replicate the pressures that comes with having real money on the line, but it’s a great way to learn the basics and get started with zero risk.
Bonus Stock Market Tip: Everything above is related to how best to invest actively - in other words buying and selling into companies that have been selected by you. But what if you don't have the time, money or inclination? What if the paragraphs above put you off? Perhaps you were looking for a simpler guide? The stock market for dummies perhaps?

Diversification allows you to recover from the loss of your total investment (20% of your portfolio) by gains of 10% in the two best companies (25% x 40%) and 4% in the remaining two companies (10% x 40%). Even though your overall portfolio value dropped by 6% (20% loss minus 14% gain), it is considerably better than having been invested solely in company E.
Once you have a specific set of entry rules, scan through more charts to see if those conditions are generated each day (assuming you want to day trade every day) and more often than not produce a price move in the anticipated direction. If so, you have a potential entry point for a strategy. You'll then need to assess how to exit, or sell, those trades.
If you’re interested in day trading, our recommendation is to allocate a small portion of your overall portfolio to the strategy – no more than 5% or 10%, tops. That way, if you lose money — as you are likely to do, at least at first — those losses are at least capped. The rest of your portfolio should be invested in long-term, diversified investments like low-cost index funds.