WordPress is written in PHP. PHP executes the script file on the server side. Then it generates the html file on the client side (that is, the web page). The html code you see is generated after the PHP program is executed on the server side.
I want to modify the html code. Mainly look at the content of the part you want to modify. Then find the corresponding PHP code. Then modify.
Click <Appearance>--><Edit> in the background, you can see the php file of the wp theme you are using now. The
names are all Correspondence, theme support functions, bottom, top, index page templates, style sheets... etc. If
you want to modify that place, find the corresponding file.