Ticker
The short symbol identifying a listed security on an exchange, such as AAPL for Apple.
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Cash Accounts
The simple, sensible default brokerage account: what a cash account is, how settlement and settled funds work, why it carries no borrowing risk, what happens to uninvested cash, and why it suits almost every beginner.

Commissions
The explicit cost of trading: what commissions are, the forms they take, how the spread and currency fees act as hidden commissions, why 'commission-free' isn't free, and how trading costs quietly erode returns.

401(k)
The US workplace retirement plan: what a 401(k) is, how pre-tax (and Roth) contributions work, why an employer match is free money to claim first, how tax-deferred growth compounds, contribution limits, vesting, and the rules around accessing the money.
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