Over a long period, investing in shares is a great way to build your wealth.
The ASX 200, or the 200 largest companies, has returned shareholders 9% over the last 30 years according to vanguard. While this doesn't mean you'll receive 9% every year (some you'll be down, others up), the share market generally trades up. Of course, if you invest in stocks that fall in value you will underperform this average. As such, you should do your research before buying any shares.