There's definitely a thing in the cryptocurrency world where everyone has to pretend to know everything. I've seen a lot of heated online arguments where people are going back and forth, then there's a strange pause where you know someone took a minute to Google a term their opponent used so they could reply pretending they knew the whole time.I knew the basics of what an ETF was, but only because I played around in the traditional stock market a bit before cryptocurrency grabbed my full attention.Then during a recent conversation with some of my very bright friends here in the Silicon Valley tech world where they confessed they have no idea what an ETF is, I realized a lot of crypto investors have never invested in anything else - so this "ETF" thing we keep talking about is a new term to them.So for everyone too afraid to ask, and those who tried to look it up... but only found 10 page long answers - here's the "what you need to know" on ETF's from experts in the field.I reached out to some of the most respected people in the world of finance, and asked them share the most important things those of us in the crypto world should know - before our two worlds come together (assuming a Bitcoin ETF gets approved soon - personally I think it will happen before the end of the year).Lee Kranefuss, CEO of The Kranefuss Group told me:President of ProChain Capital, David Tawil explained it to me like this:And Morris Armstrong, founder of Armstrong Financial Strategies added this important note:I think that about covers it! If you have any more ETF related questions you'd like me to ask the experts, drop me a line!