What is worth knowing before you invest anything?

Index funds in plain English, the true cost of a fee over decades, debt versus investing, and what happens to your money when the market falls.

What is an index fund, in plain English?

An index fund is a single thing you buy that holds every company in a published list, in proportion, with nobody choosing which ones look promising.

How much do investment fees actually cost me?

A 1% annual fee instead of 0.05% can quietly take roughly a fifth of your final balance over thirty years, because the fee compounds against you every year the money is invested.

Should I pay off debt or invest?

Clear anything charging more than roughly 7–8% before investing, because paying off a debt is a guaranteed return at that rate and no investment offers a guaranteed anything.

What happens to my money in a market crash?

It falls, on paper, and stays fallen until the market recovers — which historically has taken between several months and, in the worst cases, well over a decade.

Why does starting early matter more than starting with more?

Compounding multiplies rather than adds, and the number of years the money has been growing is the exponent — which makes time the input with the steepest effect on the final figure, ahead of the amount.