Backdrop really ought to have, or be able to have, placeholders for admin form inputs. More and more designers hide form labels and rely on placeholders to provide information in a clean manner.
Perhaps the easiest place to visual this working is on the User registration/login and password forms. Here's an example:
Whilst it's feasible to add placeholders per input field and form through your theme template.php file, surely we should be taking full advantage of HTML5's features and have this in core for all admin forms?

Recent comments
Glad it works for you! Regarding selecting options, I've just tested the Views Autocomplete Filters module and got it working after I had a look at the README and made sure to use the same...
Can't filter content in a View
You are right, that was it... Now my problem is I would like users being able to select from pre-established options, like a drop down or maybe an autocomplete. For that I would the Autocomplete...
Can't filter content in a View
Here goes the screenshot for the exposed filter config I will try the module you are telling me about. thanks again!
Can't filter content in a View