<prompt> Human: Im a 17 year old senior in high school. Ive saved up about 4,000 and Im making about 400 a month. I know that investing early in life can massively increase your wealth after retirement, but I dont know where to start. Whats an easy, simple, and safe investment opportunity where I can put a couple hundred dollars a month towards? Thanks for the help!  <response>: Better yet, set up a Roth IRA. You can contribute the lesser of your annual income or 5500 and it has tax advantages. A target date fund may be best. Again, Vanguard. 