What are some things you don’t understand about the Sutra of Cause and Effect of the Three Generations?

First of all, this Sutra of Cause and Effect for Three Generations was compiled by later generations. It has little to do with true Buddhism.

The "Jade Calendar" is even more of a fake book. Master Renchi specifically criticized that book in his book.

This kind of fake cause and effect is the biggest lie.

Making offerings to the Buddha has great merit. But the premise is that the source of the offerings should be quiet. If you take advantage of it, then this offering has no meaning.

Of course, if the person making the donation has done evil in the past, repented, and donated the money, and if his intentions are good enough, there will be good rewards. However, the bad karma done in the past will not be reduced at all.

There is a Sutra of Causes and Destinations of the Wise and Foolish on the internet, I suggest you read it carefully.