“で” or “ので” is a conjunction equivalent to and, so, as, and because, as in,
彼女は料理が好きで、特にパスタ料理が得意です
- She is a good cooker and her specialty is pasta dishes.
ウイスキーを一杯飲んでそれから出かけました
- He had a gulp of a glass of whiskey and went out.
彼は勉強家でで、中国語を3年間でで完全にマスターしました
- He is a hard-worker, so he completely mastered Chinese in three years.
彼は言い間違えたので訂正しました
- He misspoke. So he corrected it
彼は骨折で入院しました
- Because of a fracture, he got hospitalized.
彼女は愛想がいいので皆に好かれています
- Because (as) she is so amiable, she is liked by everybody.