Create a fully designed website requires lots of work and time. The Udemy web develop course instructor introduces Bootstrap which is a very popular code resource. Lots of companies and web developers use it. Basically, we take someone else's code from Bootstrap and add into our own application. It helps us make good looking sites that are responsive and quickly. Moreover, we don't have to write a ton of our own code. In the Bootstrap, you can find many customized CSS, JS and Component code for different style web design. Some codes are free to use, so you can copy and paste those code in your HTML page, and then you make your own change. How do we apply Bootstrap into our application? I am going to use button as a simple example to show you how we apply Bootstrap to our own application. Add CSS Link We go to the "Download page" , you can either download the file or just copy the highlight CSS link from Bootstrap CDN. You paste the link inside...