put the cart before the horse不要理解成马推车，引申为本末倒置。

【例句】
What's the rush? Learn to walk before you run. Don't put the cart before the horse.
急什么？先学会走路再学跑步。不要本末倒置。

To many old timers want to put the cart before the horse when giving advice to newbies.
以前不少人给新手一些本末倒置的意见。