The best thing you could do to help is to tell friends about the free online tutorials. If you have a website and can provide a link to http://www.IrrigationTutorials.com that would be very much appreciated.
I'm sorry, I am no longer answering questions.
Donations: I've gone to an advertising supported model for the website. Hopefully that will be sufficient to pay for the cost of the website hosting. I know the website is slower than it used to be, that is because I am now using a discount hosting service to keep the cost down.
Beyond the suggestions above, consider the work that I put into writing the tutorials as a gift to you, from me, in the name of Jesus Christ. (If that statement really rubs you the wrong way, please understand that it is not my intent to cause you anger or pain.)