I know the solution must be simple and obvious, but I can’t figure it out. I’m trying to put these buttons in a row and it says that I need a closing tag for all of my DIV elements. What am I missing?
On another note, I am just beginning and I’ve been stuck several times already. Are there any websites or resources my fellow CodeCampers turn to for answers? Any suggestions?
Remember to close also the div with class row. 
You have to imagine you’re building a table:
open div row1
open div column1, content column1, close div column1;
open div column2, content column2, close div column2;
etc;
close div row1 ;
open div row2
open div column1, content column1, close div column1;
open div column2, content column2, close div column2;
etc;
close div row2
Best source ever for me: google search.
For a general basic knowledge I recommend you Sololearn: I use the android app and it’s amazing!
Another great website is w3schools.