HTML 5, CSS Grid, SASS, JS

I really enjoyed this challenge! I decided to try out SASS and BEM since they work really well together, but I think I still have a lot to improve on.

Questions:

1. Any advice or tips for using the BEM naming convention? I'm having a hard time justifying making a modifier class for each change in appearance since the declarations are really short, so I usually just put them all in the same class.
2. How do I know which HTML tag to use for different parts of my page? Most of the time, I just use div, but I want to start being a little more purposeful with my tags.

Any feedback or comments are greatly appreciated!