1, Introduction to VB, 90% of the books are basic VB textbooks, just buy them. Understand objects, controls, and properties. You don't have to buy books, you can search ready-made ones online.

2, improve the first is not to look at VB, but look at the API. There are many VBAPI functions, which can perfectly interface with the system. Download the help document of a VBAPI library.

3, advanced learning VB connection database, select statements. VB connects to the network. There are fewer such books. I bought a copy of Visual Basic Database Programming, only 1/3 is useful, and everything else is nonsense. It's better to buy a book dedicated to Select statements.

4, expert level, don't look at VB, don't look at functions, and don't look at database and network compilation. It depends on advanced mathematics. When I came into contact with a huge database and huge data analysis, I suddenly realized that all the advanced mathematics I had learned had been returned to the teacher. At that time, useless derivatives and integrals will come in handy The "Newton iteration method" at the end of Advanced Mathematics is really awesome, but it was torn up at that time.