〜たところ
when I did (and found)
Verb た-form + ところ
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たところ reports an action and what you found or what happened as a result: 店に電話したところ、今日は休みだった, "when I called the shop, it turned out it was closed today".
The first part is something you did deliberately (called, asked, tried, looked into); the second is the discovery or outcome, often unexpected. It's common in reports, emails and storytelling.
Don't confuse it with the N4 たところだ, "have just done": 今、着いたところだ. Here ところ is followed by a comma and a second clause.
The meaning is close to the past と or たら of discovery (電話したら、休みだった), but たところ sounds more formal and careful.
Examples
店に電話したところ、今日は休みだった。
When I called the shop, it turned out it was closed today.
先生に相談したところ、いいアドバイスをもらえた。
When I talked it over with my teacher, I got some good advice.
調べてみたところ、簡単な問題だった。
When I looked into it, it turned out to be a simple problem.
駅に着いたところ、電車はもう出た後だった。
When I got to the station, the train had already left.
新しい薬を試したところ、よく効いた。
When I tried the new medicine, it worked well.