The phrase emphasizes the importance of steps in a process. Plan before you act, or you'll be putting the cart before the horse.
Pro Tip 2/3
Not Literal
The phrase is metaphorical, not referring to an actual cart or horse. Deciding on a job title before the job role is like putting the cart before the horse.
Pro Tip 3/3
Cultural Nuance
It's an English idiom that might not translate directly in other languages. Having lived abroad, she knew saying 'put the cart before the horse' might confuse her non-English friends.