こつをつかむ

expression, godan verb (-mu)

get the hang of; learn the trick to

Used when someone figures out the knack, secret, or effective way to do something after practice or observation.

• やっとギターの弾ひき方かたのこつを掴つかんだ。

  I finally got the hang of how to play the guitar.

• 彼かれはすぐに仕し事ごとのこつを掴つかんだ。

  He quickly learned the trick to the job.