What documentation are you looking at? FWIW, I find this forum post more helpful than the formal Rule 4.0 docs, even though they are the same thing. (Another confusing thing is that you might be tempted to look for the "Rule Machine" docs, but that is for the parent app and not of much interest if you are using it as most people do to create "child" Rule instances, besides the fact that the parent documentation explains platform concepts like "events" that you'll need to understand at some level.) The inline screenshots--and further comments from other users--make it more helpful, in my opinion:
There are also several example rules on the forum, including this thread:
Finally, asking for help--exactly as you did--is always a good thing. 
Hubitat can indeed take some getting used to (apps vs. devices, "what are events?", and so on) and Rules are hard to write until you do. The collection of built-in apps would be my first recommendation--it's tempting to write a Rule for a lot of things, but you don't often need to. The Community is full of people willing to help regardless.
