ASP.NET, please come in and explain_html/css_WEB-ITnose

Now I want to use HTML5 as the frontend, and then use jquery. What else can be used to form a complete application that can run?
Search the Internet. There is ASP.NET, but I have never been exposed to it. Is this necessary? Is there any knowledge relationship diagram or post that I can look at? I can’t put it together.

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Back-end language returns data, then you have to consider how to use asp.net to add data in the database Delete, modify and check involves the operation of data, which can be used as an interface for external calls. Then the front-end page only needs to use js ajax to call different website interfaces according to different logical requirements, and display or do other processing after getting the data, which is the so-called webservice.

The back-end language returns data, then you have to consider using asp.net to add, delete, modify and check the data in the database, which involves the operation of the data. It can be used as an interface for external calls. , then the front-end page only needs to use js ajax to call different website interfaces according to different logical requirements, and display or do other processing after getting the data, which is the so-called webservice.

I am a little dizzy, not that ajax can Is it used to transmit data? Why is there another webservice? Do we have to use asp.net to adjust the database? Is there any other way through?

The question is to whom the data is passed, shouldn't there be a powerful backend to support it? After the data is transferred, who processes it, how to process it, and how to return to the processing status after processing, these should all be operations performed by the backend. Maybe for the real frontend, he only cares about two issues. After I call What parameters need to be passed when using the client interface? What is the format of the returned data? Of course, your backend can be asp.net, it can be java, it can be php

The question is who to pass the data to, shouldn't there be a powerful backend to provide support? After the data is transferred, who processes it, how to process it, and how to return to the processing status after processing, these should all be operations performed by the backend. Maybe for the real frontend, he only cares about two issues. After I call What parameters need to be passed when using the client interface? What is the format of the returned data? Of course, your backend can be asp.net, it can be java, it can be php

Now I have some ideas, by the way, in html it can't

Submit to current page? Then can I not need to learn asp or php, at least now I can complete a movable program? Or is my understanding wrong?