Question about cloud computing in an IT blind stream

I am a low-end it technical service and maintenance personnel. I have never mentioned that I am an IT practitioner, because in terms of technology and theory, I always feel that I am too comfortable to improve myself, but I have never had much time to learn and make progress. However, due to the relationship and requirements of the job, I have been sticking to this position. It can be said that I have had a hard time crawling in this industry for 10 years. It is hard to believe that we have not improved our development at all for so many years. After all, we have had so many years of experience to talk about. At the same time, I have always been complacent about the fact that when there are many questions about computer science students in the class, I can solve them more or less smoothly. In the past, this is still the case. Therefore, we can say that there are a lot of books that cannot be learned, and the higher the theory, we also need to solve practical problems to verify. However, experience alone is not enough. If you select a computer, you will choose to continue learning in the future. Otherwise, you will be eliminated soon. This is not the case. I am preparing to take some textbooks to learn about Linux system management and maintenance. The concept of cloud computing has been fully developed, moreover, more scholars say that the management and maintenance personnel of the IT session will face the fate of a large number of employees and reduced demands, information management personnel inside an enterprise may face the risk of being fired if they do not learn and transform to cloud computing as soon as possible. Should I continue to learn about Linux system management and maintenance? Is it true that you will face the dilemma of unemployment and fried squid in the future? This is the most tangled thing recently. Therefore, it is imperative to pay close attention to cloud computing reports and news in the following work. But the more I see it, the more I advocate it, and there are very few practical cases. I began to wonder what the experts and companies are constantly promoting the concept of cloud computing and what they want to do, is it for the company's conceptual hypes or seeking out? Why don't you come up with the actual application cases of specific companies and enterprises and explain the profound concepts and practical application values of cloud computing to us? Not only do people see the cloud in the fog, but they are also very disgusted and disgusted. How many companies or companies are stupid enough to put their business data and customer information in your cloud? The powerful cloud also requires servers as the carrier. Our data will never flow in the air like the cloud, right? So what cloud era is coming when this problem cannot be solved? Especially in this industry environment in China, it is estimated that it is more difficult for you to add a specific enterprise to your cloud computing. If we talk about cloud computing, it is also impossible for various powerful groups or departments to build their own clouds, manage and maintain them themselves, and put them in the big cloud of the Internet. But I am even more confused. What is the difference between this and the B/S application architecture and cluster service? In terms of our company's applications, the company has hundreds of data centers, and then the provinces have set up Provincial Service Centers respectively. Finally, they are applied to specific companies in the following counties and cities, in a sense, can this be regarded as a private cloud? The tangle of the pole, simply do not read the relevant cloud news, or calm down to honestly look at my Linux old textbooks. When I got up and found that cloud computing was steadily flying in the air, I thought it was not too late to master it. Why is it so busy for her now?