IT IS CORRECT TO WRITE HOW BANAL IT IS USED TO ASSERT THE LACK OF SOMETHING, DIMINISH THE IMPORTANCE AND VALUE, INTEREST TRANSFORMS COMMON, ORDINARY, VULGAR, MEDIOCRE, TRIVIAL, LOW LEVEL.
The meaning of this word is something irrelevant, not leading to nowhere, the problem is that written as vanal is a mistake because the right thing is to write it as commonplace.