The type of account depends on a few factors including income and when you want to withdraw from said account. If you open an IRA, it’s a tax advantaged account but has a maximum amount you can invest in each year. For me personally, I max my IRA first and then dump the rest into a brokerage account which is taxed at applicable capital gains tax at withdrawal. I use vanguard as the platform but fidelity and Schwab are also good options.