A proverb meaning that liking something leads you to practice it willingly, so you become good at it.
ピアノを毎日弾いている彼女を見て、好きこそものの上手なれだなと思った。
Watching her play the piano every day, I thought 'you get good at what you like.'
料理が好きな人は研究熱心だ。好きこそものの上手なれだ。
People who like cooking study it enthusiastically. You become good at what you like.
仕事がつらくても、本当に好きなら努力を続けられる。好きこそものの上手なれ。
Even if the work is hard, if you truly like it you can keep trying. You become good at what you like.