Let bygones be bygones
Let it pass in the past
Official website: http://getbootstrap.com/
Find the location below, download the zip file, and extract the css and js folders.
Explain, the official can also directly download the source code, download the css and js folder inside the dist; of course, you can also compile yourself, refer to the tutorial above github
To put it simply, the use of bootstrap is mainly to use the already packaged js and css files, so you can also use the officially provided cdn file instead of downloading, and add the following code to the html head.
Specific manuals can refer to:
Description: Import js and css in the head, the template is a lot, but these three are enough, and then the specific tag can use the class to load css and js.