It's a great starter book for the financial foundations of real estate investing: https://store.biggerpockets.com/products/set-for-life-revise...I would also recommend Small and Mighty by Chad Carson: https://store.biggerpockets.com/products/small-and-mighty-re...Real Estate Rookie: https://store.biggerpockets.com/products/real-estate-rookieHouse Hacking: https://store.biggerpockets.com/products/the-house-hacking-s...

Focusing on the foundational basics and your operations is more important long term.   

In my experience, NARPM designations provide a solid foundation and are a great starting point, though they are more basic.

Quote from @John Herold: Hello all, what are some best practices for LVP floor installation for a manufactured home on a permanent foundation?

I recommend that you learn the tax code and take ownership over your strategy.Not having some foundational knowledge and an opinion on how to approach taxes as a business owner is a huge mistake.In my experience, every single business owner who says "I just let my CPA worry about it and I focus on my business" is doing a suboptimal job at tax planning.They are likely missing out on 10s or hundreds of thousands in saved dollars every year.Stop making excuses and get to work.Just a few months of part-time learning about taxes will pay you for the rest of your career.

You are looking for issues with the foundation and any other exterior anomalies like giant trees that could be in the sewer line or pressing against the foundation of the house, evidence of buried tanks, where the septic and leach field is, etc.There are plenty more things to focus on as well, but these four are often neglected by newer out-of-state investors relying on an agent or friend as their boots.What else did I miss?

The ground is now about 4-5 inches below the foundation line and it's also causing issues with my neighbor's adjacent yard.

I do know it needs P/B foundation repair, new tile, and plumbing updates.

Or any clues on the document that would allow me to spot any major problem, such as foundation, electrical, plumbing etc.?

Those skills will be your foundation.