The other option is to break down the task into it’s component parts. Looking at the example site, it looks like you’d need:
Navbar (http://getbootstrap.com/components/#navbar-default)
Div with image and text
Bootstrap Grid for Portfolio (http://getbootstrap.com/css/#grid)
Bootstrap Form for Contact (http://getbootstrap.com/css/#forms)
Bootstrap Buttons for Social (http://getbootstrap.com/css/#buttons)
Copying and pasting the sample code from the above and then experimenting with it helped me the most. As mentioned, most of that stuff is only touched upon in FCC, so I’ve used https://www.udemy.com/the-web-developer-bootcamp/learn/v4/overview to help fill in the blanks, as like yourself, I started then stopped and forgot most of the learning.
I’m pretty sure there’d be youtube tutorials for how to use Bootstrap etc if you didn’t want to go down the Udemy route.