I disagree with the advice about not lying as a blanket statement. I would agree that it is counterproductive to lie about something that could be verified, but there are good reasons not to disclose personal information and to have alternative narratives.
For example, a friend of mine was laid off by a major company as part of two big cuts. He had enough money saved, and he was eligible for generous Washington State unemployment insurance ($550/week), which meant he barely had to touch his severance package (6+ months salary). However, he was so stressed about being unemployed, that he started a job search in a frenzied state within two hours of getting laid off.
Our unanimous advice to him after a week of was to take a month off and try to get himself back to his normal, calm, human self, because he was scaring people. If he wanted, he could do all the paperwork in the world, but he was not, under any circumstances, to do any face-to-face.
If a few months later a potential employer asked him what he did for the first month after the layoff, had he responded, "I freaked out, questioned my competence, railed against fate, and had to lock myself in a room to calm down" -- the truth -- this would have been counterproductive. His official line became that he took two months off to think about what he wanted to do in the next phase of his work life, which just happened to align well with the job he was applying for. Three months after the layoff, he got a year-long contract on the third interview while waiting for an answer on the two others.
About salary negotiations, the advice I've heard from many professionals is that not only don't you want to talk salary before you've been made an offer, during the offer you don't want to be the first to mention a number at all, which can turn into a big game of chicken. In this case, silence and a calm stare-down is supposed to be your friend. Salary is only part of the package, anyway.
"I'm sure if we're serious/you're ready to make an offer we can come to an agreement that works for both of us." (but now we're trying to determine if this is a good fit for us both.)
"I've been paid fairly/well-compensated for my abilities and education/training, etc."
"I'm sure you know that [ex-company] pays 50% of the industry average, but also offers stock options/five weeks vacation/flex-time, etc."