The speaker provides advice on how to be a successful investor. Firstly, they advise avoiding risky investments such as start-ups and private businesses. Instead, invest in public securities, particularly in companies that are well-established and have a good track record. Secondly, invest in businesses that you can understand and have a reasonable price. Finally, invest in businesses that you can own forever, those that sell a product or service that people need, and that are somewhat unique with brand loyalty. Examples include Coca-Cola and McDonald’s.