You change the layout so you can edit individual bytes when browsing memory.. When toggling the view you can misplace where you were, so I go back to the value and as I scroll you'll see the string representation for "resources bar 1".
Byte edit the 1 to 2.
In a way yes. But also no. On the server if like another game I did it with, they just see the currency got added. Just like anything though, don't abuse it and could get away with it.
With me sharing publicly, developer has a chance to patch it. I don't think it will be easy though.