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Likes, skill and understanding

Use が with what someone likes, dislikes, understands or is skilled at: 日本語が分かります. 好き and 上手 behave as な-adjectives. 大好き means like very much. To speak modestly about your own ability, avoid praising yourself as 上手. 好き is not a verb, so 好きます is wrong.

〜が好きです / 上手・下手 / 分かります