Time is your most valuable currency.

This book will give you a historical context as to why money (currency) works the way it does today.

Investing in international real estate is another nice way to diversify and not have all your assets invested in the same countries and currency, which isn't very prudent.

Gift cards...the universal currency. 

You also need to know currency of rents (seller owns any past due, you start fresh).  

The dollar, like all fiat currencies is on a path to its own destruction. 

Or you could simply use websites like BlockFi and buy either crypto currency like bitcoin and etherium and collect 6% interest on bitcoin, or 5.25% interest on etherium while you (hopefully) also get price appreciation. 

For me it took about 3 months and was about $240 dollars worth of currency and hustle.

(Do they ever have step wise increment in your preferred percentage based on amount invested). for ex 50K 6% ; 100K 8% etc. 

@Suresh Kannan My father and I have a financial market background - he's a professional trader (Forex & Futures) and managed a small hedge fund for years - I was on the financial education side of the business.