After my first question was answered so beautifully, I would like to ask some more. :D
I wanted to know how to use conditionals for events in the past, like: "If I had saved my money, I would be rich now.", or: "If he hadn't eaten that many sweets, he wouldn't have become fat."
I did a google search, but somehow, all of the sites I found had different answers which contradicted each other, as each of them claimed their answer to be the only correct one.
I also found something on this site. In an answer here: Differences among -たら、なら、-んだったら、-えば, etc, there's the example:
If I had turned right back then, I wonder what would have happened.
So it seems like "-ba" is the right conditional to use in this case, but because I have read so many different answers already, I am still unsure and would like a longer explanation about which conditional(s?) can be used to build a correct sentence of the type: "If X had happened (but it didn't), then Y."