Help me make my new variant! (please!)

[will_asher]

How do I know if it's writing beyond the boundaries of an array?
and How do I know what the boundaries are?

When I first started making DaJAngband, I just discovered the txt files in the lib folder (the subfolder was called something other than gamedata at that point), and changed some things and added some new monsters. I posted about making changes in the txt files on here, and someone suggested I make my own variant. I said I can't do that I know only the barest basics of C, but they said something to the effect of Oh it isn't hard, you can probably figure a lot of things out by the comments. So I looked at the code, and the comments were so thorough in saying what the code was doing, that I could figure out how to customize a lot of stuff in the code. I'm a meddler, not a programmer, but I made my own variant before. I can do it again (with the help of the nice people here).