I'm not a programmer, but from what I've read, GOTO's are generally considered poor programming these days, and should be avoided whenever possible.
A better option, as I understand it, is to set up shell functions that you can import into the 'if' loops as needed. linuxcommand.org has an easy-to-understand explanation of them here
As for bash-related questions, I've generally gotten the best advice simply from the general linux forum. There's also the programming forum, which I guess might be better for advanced scripting questions. The forums all have clear descriptions listed, so simply choose the one that sounds like it best matches your question. If you're wrong, the moderators will simply move it to where it should be.