Ask an experienced investor what matters most in a portfolio and many will skip past which fund or which company. They will talk about the split: how much is in stocks, how much in bonds, how much in cash. That split decides most of how a portfolio behaves, in good years and in bad ones.

Stocks: growth, with a rough ride

A stock is a small piece of ownership in a company. When companies grow their profits over the years, their shares tend to become worth more, and many pay part of their profits out as dividends. Over long periods, stocks have been the main source of growth for most investors.

The price of that growth is a bumpy ride. Stock prices can fall sharply, sometimes for reasons that have little to do with any one company, and they can stay down for years. Anyone who holds stocks should expect to see their balance drop a long way at some point. That doesn’t mean something has gone wrong. It is how stocks behave.

Bonds: steadier, not risk-free

A bond is a loan. You lend money to a government or a company, it pays you interest, and it repays the loan on a set date. Because the payments are agreed in advance, bonds usually move much less than stocks.

Bonds can still lose value. When interest rates rise, older bonds paying lower interest become less attractive and their prices fall. Bonds from weaker borrowers pay more interest because there is a real chance they won’t be repaid. In a portfolio, high-quality bonds mostly act as ballast: they soften the falls and give you something steadier to draw on.

Cash: safe in name, but it shrinks

Money in a savings account won’t lose value from one day to the next. That makes it the right place for money you will need soon and for an emergency fund. Over long periods, though, prices rise, and cash that earns less than inflation slowly loses buying power, year after year.

Putting the three together

There is no split that is right for everyone. Two questions do most of the work. When will you need the money? Money you need in the next few years shouldn’t depend on the stock market recovering in time. And how would you actually react to a big fall? A plan you abandon in the middle of a bad year does more damage than a more cautious plan you stick with.

Over time the split drifts on its own. After a good year for stocks, they make up more of your portfolio than you intended. Many investors check once or twice a year and move money back toward their target. This is called rebalancing.

Harust’s portfolio summary starts with exactly this: your split between stocks, bonds and cash, and what it means for how your portfolio is likely to move.