Note that it is entirely possible to invest in almost all “non-traditional” things within a retirement account; “checkbook IRA” is a common term for a structure that enables this (though the fees can be significant and most people should definitely stick with index funds). Somewhat infamously, Peter Thiel did much of his early angel investing inside his Roth IRA, winding up with billions of dollars in tax-free gains.
Note that it is entirely possible to invest in almost all “non-traditional” things within a retirement account; “checkbook IRA” is a common term for a structure that enables this (though the fees can be significant and most people should definitely stick with index funds). Somewhat infamously, Peter Thiel did much of his early angel investing inside his Roth IRA, winding up with billions of dollars in tax-free gains.