Yes, there are definitely two ways, the same as most European languages. This is fully explained in the duolingo course notes for skill "Present 3" but in summary:
- "Dych chi" is the polite, formal version, also used if there is more than one person.
- "Wyt ti" is the informal version, used with close friends or from an adult to a child, and only used if it's one person.
If you know a little French, it's the difference between vous and tu.