A, a person should know a hard knowledge, the most important thing is to know some math knowledge:
It is never too old to learn before one can make continuous progress. But as an adult, if you don't know some hard knowledge, you will make your life a failure. An adult must learn some math knowledge, and never say it is unnecessary. If you don't have some math knowledge, you will suffer in many jobs. For example, after changing jobs, you need to calculate the ratio of your salary to tax, and you need to pay attention to the situation of five insurances and one gold. Suppose you want to buy a house, how to calculate the loan at this time and how to save more money. You won't believe the recommendation of the bank. At this time, you need to have some mathematical knowledge, so as not to suffer. In addition, in daily life, we need to have some mathematical knowledge about property fees and electricity charges. In addition, how to make the decoration more cost-effective, adults need to calculate for themselves. Without mathematical knowledge, you can only be completely blind.
Second, to be a man, we should learn some psychological knowledge. These hard knowledge will benefit you for life:
Psychology is very important to a person. We can find the right person in our life and how to get along with colleagues and leaders in our work. In fact, we can all get the answer from psychology. If you don't have psychological knowledge, you will inevitably suffer, so psychology is very important hard knowledge.
Three, adults should learn basic philosophical knowledge, this kind of hard knowledge must learn:
Adults should learn some philosophical knowledge, because basic philosophical knowledge can help you understand the essence of things, understand some experiences in life and sum up the gains and losses in life, so philosophy is very important to adults.