Formal:
* Croeso! (pronounced "cro-eh-so") - This means "Welcome!" and is a polite way of acknowledging someone's thanks.
* Dim problem! (pronounced "dim pro-blem") - This is a direct translation of "No problem" and is a casual, friendly way to respond.
Informal:
* Does dim! (pronounced "does dim") - This means "You're welcome!" and is the most common way to respond to "thanks" in Welsh.
* Dim byd! (pronounced "dim bid") - This means "No worries!" and is another casual way to respond.
* Hwyl fawr! (pronounced "hweel vour") - This means "Goodbye" but can also be used as a more formal way of saying "You're welcome" in some contexts.
Ultimately, the best way to respond to "thanks" in Welsh is to choose the option that feels most appropriate for the situation.