Real Estate Investing - The Best Wisdom

i think i've fallen into this an a lot of investors n our generation fall into it where we're not going to be very invested, or near fully invested. But what i hear from buffet and all these great investors, they basically say like, well, you can't really bank on that happening,. You're going to miss so much by not investing. Just kind of make good deals, ifi try to find good deals. I am extremely risk averse. And one of the things i worry about with real estate investing is cost side. How do i know what i can actually rent a property for? Do you only invest in properties that have a tenant that's going to stay with