There is some spectacularly bad advice out there, so even if someone is trying to find out, they can be sent off in a direction that makes them look bad.
In university I got application advice from professors in my field. Our national professional conference had student workshops the day before the meeting started, covering things like applying for jobs and doing presentations, inside and outside academia. A career centre wouldn't have been particularly useful, because they wouldn't know the standards for my field.
For example - standard advice is to keep the CV to two pages, max. In my field, the first page or two would list details - name, citizenship (this is a practical detail for international applications), languages spoken, education, a list of relevant jobs you've held, a list of professional awards or honours. You would then have sections for details of professional experience (committees you've sat on, supervision, teaching experience (including courses you've taught), management experience, invited talks you've given, recent conferences you made presentations at, and technical expertise, depending on the type of job. Then a list of publications in refereed journals, in a standard format. A typical application would also include a summary of your previous research interests, and your future plans for projects, written in essay format, of a few pages in length. And a cover letter, of course. The total for a junior position would be at least six pages, for a senior one could be up to twenty.
One the other end - I actually have done professional interviews in jeans, t-shirt and hiking boots (it wasn't a scheduled interview, more a chance meeting at a conference) and got a job offer.