Wattpad has millions of books, so there might be a chance that the title you chose already exists. And that's fine as long as it doesn't relate with any other books.

- Don't pick a title that millions of books already have.

example: "Falling For Her/Him" "Attraction" "Love"

- Don't pick a title that will make the reader think "wtf?"

example: "Her Clothes" "The Toothbrush" "The Hair"

- Don't pick a title that has nothing to do with the book.

example: "It All Started In The Coffee Shop"

I don't want to shade on any Wattpad books but I've seen titles like this where two people meet in a coffee shop and that's it, that's the only time where they mention the coffee shop....

EXCEPTION: If your title is going to be something like this, where the place they met or something specific is important to the story then use it!

Make it an important place so that every time you mention it in the book, the readers know that, that place or thing holds something sentimental for the mc's.

- Don't pick a title that will give anything away.

For example, ( this only applies to fanfictions ) if your book is about a love triangle, don't title your book "Love Triangle" when the celebrity you chose is right there in the cover. That just gave away who the mc is going to end up with with at the end. Instead add both celebrities on the cover if possible.