title: Which bootstrap css and javascript files should be linked to our html page?
body: <p>I have downloaded the latest <a href="https://getbootstrap.com/" rel="nofollow noreferrer">bootstrap</a> version 4 in my computer and  it contains two folder one <code>css</code> and other <code>js</code>. The css folder contains about 12 css files whereas the js folder contains about 5 javascript files. Do we need to link all these 17 files to our html page? Is there a simple way to link css and js  by folder?</p>