Check out a YouTube video on Boostrap called Bootstrap Tutorial by Derek Banas. The code for the video can be found on his website. I have another post at this website that shows some of the code from the video. You can copy that code into an html file of your own and then open that file with a browser to see the results. This site’s post is called Bootstrap Introduction Video Tutorial.
You can download a Bootstrap Cheatsheet in pdf format from Cheatography.