〜が好き / 〜が嫌い
“I like coffee” is simple in English. Japanese expresses the same idea with a different kind of word and a different sentence pattern.

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In English, like is a verb: “I like coffee.” In Japanese, 好き is a na-adjective. In 私 は コーヒー が 好き です, 私 is the topic and コーヒー が identifies what I like. Translate the whole sentence naturally as “I like coffee.”
For this basic pattern, learn the thing you like + が + 好き です. Do not copy the English verb structure and put を after coffee. 好き describes a preference rather than an action performed on the coffee.
Because 好き is a na-adjective, its negative is 好き じゃ ない です. 嫌い expresses dislike and follows the same pattern. Although it ends in い, it is a na-adjective, so use 嫌い じゃ ない です, not 嫌くない.
Examples
私 は コーヒー が 好き です。
I like coffee.
けんさん は 音楽 が 好き です。
Ken likes music.
私 は 魚 が 嫌い です。
I dislike fish.
猫 が 好き です か。
Do you like cats?