If my money is post-tax in a standard E-trade brokerage account, what makes a Roth IRA special?

Hello – this may be a dumb question. I’m a beginner to all of this. But my thinking is that if I’m investing in my standard E-Trade brokerage account with post-tax money that I invest after I get my paycheck, what makes the Roth IRA advantageous? Is it because I also have to report my earnings in April for annual taxes? Would I not have to do this also for my Roth IRA if I were to withdraw earnings at 60 years old? Thanks – sorry if a dumb question. I’m young and trying to learn more, and figure out where is best to invest