Do you have links to approachable and beginner-friendly educational material?
What does "focus on investments" even mean?...
Like, imagine being me. Just a hard-working guy all his life. ZERO CLUE about financial markets. Null. Nil. Void.
How do you start them up?
But... I don't even know HOW do you increase your wealth. I suppose speculation but outside of that I have zero clue. I am aware that people "buy low, sell high" but beyond that, nothing. Plus, there's a ton more out there compared to the normal stocks, no?
Where can I learn about various entry-level wealth increase techniques?
https://jlcollinsnh.com/manifesto/ - skim this, see if it's interesting to you
follow up with https://jlcollinsnh.com/stock-series/ if so
Once you understand the basics of assets, liabilities and cash flow it will be much easier to understand other concepts.
From there think about what would interest you and dive in.
If it's stocks then the ASX has some excellent PDFs explaining how it all works.