In this sentence :
"You also learn what it takes to make money: a lot of effort.”
The main verb is "learn". The verb Takes is also a verb but since it is within the next clause and it is the verb of the Cataphoric refrence "it" such verb cannot be considered the main verb of the sentence.
So your final aswer is Learn.
https://study.com/academy/lesson/what-is-a-counterargument-definition-examples-quiz.html
On this website they have examples
Answer:
1) He discovered the sensations of light, dark, hunger, thirst, and cold.
2) He discovered that he was a monster
Explanation:
1) He discovered the sensations of light, dark, hunger, thirst, and cold. According to his story, one day he finds a fire and is pleased at the warmth it creates, but he becomes dismayed when he burns himself on the hot embers. He also realizes that he can keep the fire alive by adding wood, and that the fire is good not only for heat and warmth but also for making food more palatable.
2) He discovered that he was a monster
His presence causes an old man inside to shriek and run away in fear. The monster proceeds to a village, where more people flee at the sight of him. As a result of these incidents, he resolves to stay away from humans.
