I am a big fan of ETFs and use them for about half our portfolio, but there is nothing magic about them, so do not be fooled by folks touting them.
Here is a list of pros and cons: ETFs vs mutual funds - Bogleheads
Folks who are used to placing stock orders do just fine with ETFs because they know about market orders and limit orders and what price they want to place the limit price at and not getting ripped off by placing stupid orders.
Folks who get anxiety attacks and who have a fear of getting ripped off hate ETFs and prefer to use mutual funds where one is always guaranteed a fair price.
Vanguard ETFs are great for folks who do not use vanguard as a broker, but if you use vanguard as a broker, you might as well use their admiral share class of funds instead of ETFs.
If you insist on using ETFs, try out just one for now and see how you like the mechanics of placing a trade, getting a distribution, reinvesting the distribution, selling shares, etc. You may find it suits you or you may have an anxiety attack.