Ask HN: Which predictive analytics tools do you use and for what?

I'm a marketer, writing a post about predictive analytics tools, but I'm a little confused.

Here are some of my questions that I'd really love to read your answers to:

1. What does a predictive analytics tech stack look like? Which tools do you use for which purpose? Examples would be phenomenal! 2. Are there alternatives to the above tools for SMBs? 3.How much data do you need to have until your predictive analytics gets smart enough to predict things accurately? 4. What are the typical "triggers?" 5. What are some practical, lesser known ways to use predictive analytics in marketing/CRO? What can you do with these predictions? 6. Anyone think predictive analytics is BS? If so, why?

Sorry for all the questions. I'd really appreciate any and all insight or points in the right direction! =)