On the technical side, there's a lot of grunt work that's completely unrelated to machine learning but underpins modern AI. E.g. high performance computing and numerical techniques have zero relevance to day to day LLM research but makes or breaks the implementation. There are better reading list for those but you need to at least have a vague understanding of what numerical methods or a math kernel is before starting to lecture others on the economics of ML scaling and hardware. For stuff like data cleaning and scraping, it's a well known gray area field so you aren't gonna find too many for dummies guide on it. Can't have honest discussions on hacker news either because the people here get their panties in a twist over data scraping despite many of them doing it with zero hesitation or compunction if it comes up in a jira ticket. Proxy farms are the unsung hero of LLM engineering.