The most confusing part of learning Japanese language is particles (じょし)! Today I would like to share how to use "particle で" as a place of action marker.
Particle "で" usually goes together with "action verb" "で" indicates the place where that action takes place. Let's have a look of these sample sentences.
わたしは きっさてんで おちゃを かいます。
I will buy a cup of tea at the café.
お母さんはスーパーで肉を買いました。
My mom bought some meat at the supermarket.
大学で英語をべんきょうしましたか？
Did you study English at the university?
いいえ、私はスカイプでべんきょうしました。
No, I studied on Skype.
Keep in mind that particle "で" cannot be used with stative verbs including verbs meaning "moving toward direction"（行きます、帰ります、来ます）.
タイで行きます。This sentence is incorrect because 行きます isn't working as an action verb. It means that you are moving towards to the place. タイへ行きます or タイに行きます are more appropriate in this case.
タイでマンゴを食べます。I will eat mango in Thailand.
タイで水泳したいです。I want to swim in Thailand.
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