A good question is one that attracts good answers and is interesting to people who are knowledgeable on that topic.
Stack Overflow does not allow broad or vague questions simply because they don't attract good answers. We will need to choose how accepting to be based on what the community is willing to answer.
How to Improve Emacs Performance?
If this was about a specific snippet, then it's possible to answer. As is, this is simply too broad and I can't imagine a question that would deserve to be the accept answer.
Things to avoid when writing elisp.
I think a community wiki post that lists the most common pitfalls (especially for users coming from other languages) would be a reasonable answer here.
How can I organise my init file?
At a high level, there aren't many ways to organise it: one big file, convert it to a literate org file, split it into separate files, or use something like
use-package. Again, I can imagine a reasonable accepted answer for this question.