The table in this blog post is a good start: https://govclab.com/2022/11/07/managing-fund-expenses-for-venture-capitalists/

There are no best practices here. Every fund is different. For example, a Deep Tech fund many need to spend a lot of money to perform heavy IP diligence on an investment and it may be justified as a fund expense. Another fund may be required by LPs to have an audit and that is also the justified as a fund expense. Finally, every fund expense has an opportunity cost because that is capital that could be deployed into a startup. Therefore, most new and emerging GPs with small fund-sizes that are optimized for the carry try to keep fund expenses to a minimum.