Which is correct? Backyard, back yard, or back-yard?
Word choice matters. Choose words that are the least ambiguous.
This grammar myth is, thankfully, less pervasive than some others I’ve addressed. Still, I regularly encounter folks who believe there is a general prohibition against starting a sentence with the word because. Others, who’ve never heard of this dubious rule, scratch their heads when they hear it because it seems so arbitrary.
It’s not, however. There is a reasonable explanation for the idea that a sentence beginning with because is anathema.