Step 1 of 3: What is a unit trust?

It is a pool of money (a trust) that you can contribute to. (When you do, you own 'units' of this trust). This pool of money is invested by professional fund managers into:

Stocks (generally medium to high risk)
Bonds and other fixed income instruments (low to medium risks)

If the value of the investments which the unit trusts invest in increases, your 'units' will be worth more than the price at which you bought it (i.e., you make money!)