Diversified, low-cost funds that track baskets of assets.
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Two ways to own a fund — and the practical differences that matter. How ETFs and mutual funds (including UK OEICs/unit trusts) differ in trading, pricing, minimums, tax efficiency, costs and transparency, and how to choose between them for your situation.
The fee is the one thing you can control, and over decades it is enormous. What the expense ratio (OCF/TER) is, the brutal arithmetic of how a 1% fee compounds against you over 30 years, the hidden costs beyond the headline figure, and how to compare funds on what really matters.
Arguably the most important idea in investing for ordinary people: owning the whole market cheaply instead of trying to beat it. What an index is, how index funds replicate it, why passive investing beats most active management after costs, and how regular investing turns it into a wealth-building habit.

A complete guide to exchange-traded funds: what they are, how they deliver instant diversification, how they track an index, why low costs matter so much, the main types, and the risks.