I don't really understand dilution and how different forms of fundraising and employee compensation work

I don’t really understand dilution and how different forms of fundraising and compensation for employees work. I’ve heard people say equity is the most expensive money, but I’m not really sure what that means. I started the company, so I should own it. I understand that investors want equity, but if I give them too much, it won’t be my company anymore. Even if I never give any investor more than 50%, f I keep needing more money, it won’t be long before I have less than 50%.

I don’t have a ton of cash, so I’d like to pay people with options. How do options dilute me?

My lawyer told me that 20% is usually set aside for options. That means I only own 80% before I get other investors. If I give investors 31% for their investment, I lost control, right?