How vim adopts different key mappings for different languages

Question

I want to map braces to input opening braces to have this effect

int main(void){
    //缩进了
}

I can achieve the effect by modifying the .vimrc in the home directory. The problem is that this setting is effective for all files.
C I want to have such an effect, but other languages ​​​​(such as python/lua) I don't want to have such a mapping. How can I set up vim for a certain language?
Which file do you want to modify?

Answer 1

is also written in .vimrc, but the file type must be specified:

filetype indent on
autocmd FileType cpp setlocal ......
# 后面省略号为具体设置，空格分隔，缩写见下表

Variable name	Abbreviation	Meaning
(no)autoindent	ai	Auto-indent, which automatically adds the same indentation to new lines as the current line.
(no)cindent	ci	Similar to the indentation of C language programs
(no)smartindent	si	Some improvements based on autoindent
tabstop=X	ts	How many spaces does one TAB character occupy during editing?
shiftwidth=X	sw	Use the number of spaces per level of indentation.
(no)expandtab	(no)et	Whether to automatically expand the input TAB into spaces. To enter TAB after opening, you need Ctrl-V<TAB>
softtabstop=X	sts	It is convenient to use the backspace (BACKSPACE) key after opening et. Each time you backspace, X spaces will be deleted
(no)smarttab	(no)sta	When turned on, pressing TAB at the beginning of the line will add sw spaces, otherwise ts spaces will be added.