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Investment strategy for a 20 year old with about 30k in bank account
If you have already maxed your TSP contributions, the "401k" for military folks, you could consider a Traditional IRA contribution. They are tax-deductible, based on some limits, so it may reduce your tax liability. Many online services (Vanguard, Fidelity, etc.) offer quick and free setup of Traditional IRA accounts. If you have already maxed the Traditional IRA as well, you could look at making taxable investments through an online service. Like homer150mw, I would recommend low-cost funds. For reasons why, see this article by John Bogle.