I'm a newbie worker and investor in my early 20s. I maxed out a Roth IRA contribution for this year with savings from a summer job; I start full-time work later this year after finishing grad school. After reading the advice on MMM and a couple of Bogle books, I've put most of my additional savings into VTSAX, in a regular brokerage account. My question here is, are there any other non-taxable accounts I should be opening to invest with? I know you can't add a regular IRA to the Roth (I chose a Roth because my income from just a summer was low enough). Thanks!