Please answer 2 questions

Do all logo templates have to be both vertical and horizontal?
What is the meaning of resizable chackbox in the submission form?

No, you do not need both a vertical and horizontal versions, but it does help to have both.

“Resizable” means that it can be resized without losing quality, such as a vector made in Illustrator.

hi this is a plus for the potential buyer , this helps to preview what it looks like and that is easy to “arrange”