The embed options are all capitol letters, or all lowercase letters, and or specialized computer symbols ect.
Each one adds size to your file, so if you only embed say, lower case letters, you would only increase your file size by so much, BUT you have to take all the lower case letters… not just the one’s you want.
If you HAVE to use those letters in that font, you’re better off breaking the letters apart under your “modify” menu. You’ll only add a little file size that way. I do it all the time and it hardly every causes that much fuss.
Embeding the font is for something where you are going to use most of the letters in the alphabet and they HAVE to be seen in that font.