It depends on whether you are speaking British English or American English. In American English we don't say indeed very often. That is more of a British word. For instance, if someone said to you, the weather is beautifully today. I have been so tired of all the clouds. If you were in the US you could respond with "exactly", meaning, exactly, I agree with you. If you were in England and someone said the same statement to you, they could say "indeed", which in this context means the exact same thing...indeed, I agree with you.