2. Suggestion: Never mind the teaching website, it is of little use. There are too many counseling materials, just buy a basic one. Don't buy anything like "daily mathematics" and "solving many problems in one problem", and don't buy the art of war in Huanggang, which is difficult. We must pay attention to mastering basic things and basic concepts.

3. Read the book carefully and see through the contents of the book.

There are exercises at the back of the book, which should be understood.

In a word, the key lies in the textbook.