I'm new to ImoLaza; my old Rain Bird sprinkler system has been working fine for the past twenty years. My son got me this new one last week and set it up for me, saying it would make things more convenient. The app looks pretty user-friendly, but when it came to setting up the different zones, I got a bit confused. There are so many technical terms like application rates and allowed depletion that I didn't have to deal with on my old system. Could you offer me some guidance?