Question word + 〜か
(who / what / where …) inside a sentence
Question word … plain form + か + 分かる / 知る / 教える
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A question can sit inside a longer sentence: 会議が何時に始まるか知っていますか, "do you know what time the meeting starts?" The inner question ends in plain form + か, then comes a verb like 知る, 分かる, 教える, 聞く or 覚える.
Nouns and question words take か directly, without だ: 駅はどこか教えてください, "please tell me where the station is".
Use this when the inner question has a question word (who, what, when, where, why, how). For a yes/no question, it's かどうか, the previous point.
In speech the か is sometimes dropped (何時に始まる知ってる?), but it's safer to keep it.
Examples
会議が何時に始まるか知っていますか。
Do you know what time the meeting starts?
駅はどこか教えてください。
Please tell me where the station is.
誰が来るか分かりません。
I don't know who's coming.
何を買ったか覚えていません。
I don't remember what I bought.
どうして遅れたか説明してください。
Please explain why you were late.