Okay I’m getting the hang of it now. If this happens then do that, or ifttt.
First you choose the service where something will happen and then you choose the service that will act on it.
The first one I set up looks at Apple stock and when it hits $425 I automatically get an email telling me so.
Another one: When I post something new to WordPress a tweet is posted with the title and link. Getting the idea?
Go to ifttt.com and try it out.