I’m no expert here, but my $.02 is …
The line between front end and back end is getting increasingly blurred. Many of the ads I see for FE jobs expect a little knowledge of BE, and vice versa.
I learned a lot by doing the back end section. First of all, it gave me a really good view of the big picture and how things were really working. Secondly, there are some cool BE tools you can use in Node (like webpack and create-react-app) that make doing front end work easier.
Keep in mind the BE section can be frustrating as the FCC training isn’t there yet so you’ll have to do a lot of research. I found the book Express in Action very useful (until you starts talking about Angular) and there are some great youtube videos.