Learn Turkish: Rica ederim, çok kolaydı. - You're welcome, it was very easy.

Yes! The word rica means request, and ederim means I do. So literally, it means I request. However, it is the standard, everyday phrase used to mean You're welcome or Don't mention it when someone thanks you.

Where is the word for "it" in the second part of the sentence?

Turkish often leaves out pronouns like it (o) when the meaning is clear from the context. Because kolaydı has no specific person ending (like those for I or you), it automatically means he, she, or it was easy.

How does kolaydı mean "it was easy"? What is the -dı at the end?

The base word is the adjective kolay, meaning easy. The -dı suffix is the past tense ending. When you add it directly to an adjective or noun, it acts like the English word was or were. So, kolay (easy) becomes kolaydı (it was easy).