でも
but (at the start of a sentence)
Sentence。でも、sentence。
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でも starts a new sentence that contrasts with the last one: 日本語は難しいです。でも、面白いです, "Japanese is hard. But it's interesting."
It's the conversational "but" for the start of a sentence. が and けど do the same job inside a sentence, joined to the first clause. でも can't go there: 難しいでも is wrong.
It's used in replies too, often to push back gently: でも、高いですよ, "but it's expensive, you know".
In writing and formal speech you'll see しかし, "however", in the same position. だけど is a casual alternative in speech.
Examples
日本語は難しいです。でも、面白いです。
Japanese is hard. But it's interesting.
行きたかったです。でも、時間がありませんでした。
I wanted to go. But I didn't have time.
でも、高いですよ。
But it's expensive, you know.
雨が降っています。でも、出かけます。
It's raining. But I'm going out anyway.
疲れました。でも、楽しかったです。
I'm tired. But it was fun.