How many properties do you need to retire on rental income

We build a property investment portfolio to build wealth, and ultimately gain financial freedom and get out of our 9-5 job. How many properties do we need to retire modestly or comfortably? The answer depends on what type of properties we buy, what sort of rents they get, ongoing expenses such as agent management fees, …

Pros and Cons of Interest Only Loan vs Principal & Interest Loan

Yesterday I had a lengthy debate with my friend.
The question that always come up when a property investor wants to buy an investment property:
Should he get an Interest Only loan, or pay the Principal & the Interest?