Topic
Investing
The portfolio-level questions: how much of your money sits in the same few companies, and how many holdings it takes to spread the risk.
An index fund, a growth fund and a handful of favorite stocks can all turn out to own the same companies. Add up that overlap from the funds' own holdings, then decide how much concentration you actually mean to have, since a deliberate bet on a few names and an accident of owning several overlapping funds call for different fixes.
For the retirement side of investing, the free courses cover tax-free accounts, withdrawals and Social Security in order.
Concentration is easy to miss because it hides inside funds. A cap-weighted index gives its largest companies the largest weights, so a portfolio built from two broad index funds and a few favorite stocks can hold the same handful of names three times over. The Mag 7 case study adds that exposure up on a hypothetical portfolio, and the guide on how many stocks to own shows what one bad holding does to a portfolio of ten positions compared with one of twenty-five.
The data for all of it is free at the source. Company filings sit on the SEC's EDGAR system, fund holdings on each fund's own page, and economic releases on the sites of the agencies that publish them. The trader resources guide lists the official sources worth bookmarking, what each one is good for and how often it updates.
Strategies
Case study
Mag 7 Case Study: How Much of Your Portfolio Is Seven Stocks?Count your look-through exposure to the seven before buying more of any of them, and set a cap on it in advance.