New to investing
New to investing here. 36 F, I have my Roth with maxed contributions, 401k through work, and now I have 40,000 to invest. Was going to put all in VTI, watch, and contribute 300/month for at least 25 years. Do I need to diversify this or is 100% in VTI going to pay out in the long run? Thanks for the advice!