How to Pronounce the Sound -s after -th or -st in English

In this video, Alisha answers 5 questions. - I'd like to know why we have to place "incarnate" and "galore" after a noun. And how do you pronounce the "s" after a "th" or a "st" sound,like months and scientists. - I wanna to know the difference between "right now" and "right away" and when we use both of them. - What is the differents between "mistake" and "error" - What does "straight up" mean? And how can I use it in a sentence? - Whai is difference between "lay","lie","lying" and "laying"? How you use and pronounced these in your daily life?