When a person leaves your company, even if that person is you, the founder, there are rules in place that prevent trade secrets from being used to harm the company. Chief executive officers (CEOs) often believe that they're immune from these rules, but there is a possibility that you could be accused of stealing your own trade secrets if you're fired from your company.
Patents are important for people who create for a living. If you design an invention, it's something you want to protect against others who would copy it and sell it as their own.
When you're ready to get your business up and running, one of the things you'll look into is obtaining a trademark and registering it. You don't need to do everything all at once, but knowing about trademarks is important. For instance, you need to know how long a trademark will last.
Trademark dilution is a term you may not have heard before. It refers to using a trademark in a way that "dilutes" the owner's trademark. Dilution doesn't just happen when someone infringes on a trademark directly. Parodies of trademarks could result in dilution as well.