the mind with the activity in the life

How can we decide the action to the activity in the life?
How many choices did we take from our mind for our basic need and the need of better life quality?
During the process of school, we have started to learn how to take our relationship with others by interact with other's choices.
At the process of learning, we have know many different knowledge and different people from the whole world as long as you take enough grade from the teachers and your classmates.
But can we really understand the knowledge which we learned?
Our brain is useful on learning something that we don't know and use the knowledge to do something for making a living or the interest etc. , but our brain isn't useful on understanding something that we know as everyone will take different views. The different views comes from people's different environment or the knowledge system, family value to the knowledge etc. . That's why we just know something but we can't really understand something. If you know lots of different language in the whole world, you will know what I talk about . For example, we can go shopping in different place such as department store, street store, local business, internate shopping etc. , and how do you decide the store for shopping? There are so many same brand business in the different stores for your happy shopping. Do you feel you are a wonderful customer to the stores which you go shopping very often? Do you just chose the store which is near by your home to get your shopping with the convenient ?
No matter the price or the shopping environment with the different shopping way, you will take the brand into different way which is different with others. Maybe you can say everyone buy the same product, and everyone goes to shopping in the same way such as the common action of visiting the department store in the New Year Day. But the action just let you know it's something which everyone does but you just can't tell others why you spend the money on this at that time. Or you can say I really like the brand for my everything, then you can just do the same thing like others. That is just what you know as you read the newspatpers or others, and it's not understand why people take the same shopping activity.
To know something which you don't know will make you more confidence to meet the different culture and understnad yourself in the knowledge process, but to know something that you know will make you forget the knowledge is really something that we can't understand as our time is so limited that we can't really reak the whole books and communicate this with others.
But if you know how to do something with knowledge , it just means you start to understanding somthing and the process is continuing in your life.