Be careful of hyperbole.
To invest, when the rubber hits the road you need traction.
Traction is cold hard cash money seasoned in a bank account.
Cash Accumulation is the most needed thing for many people.
You cannot invest what you do not have.
Initially before you invest, your success is measured by how much you have in (for instance) your Vanguard Money Market Fund, or an FDIC insured Money Market account, or stuffed inside your mattress, etc...(whatever it is you use).
Some people borrow against their personal residence with a HELOCK for this needed cash, but I've seen those go bad in several instances, and the results were not very pleasant for the borrower.
In many instances working a second job can allow you to set aside cash, or you might inherit it, or find a cash filled partner.
But the bottom line is, initially your success is measured by how much cash you have to invest.
And be careful of Hyperbole.
Good Luck!