The 3 Fund Portfolio is popularized by the Bogle head community. This portfolio is a simple 3 ETF portfolio that provides vast diversification. Here are the ETF youll need to build this for yourself: 1. VTI - Vanguard Total Stock Market Index Fund ETF 2. VXUS - Vanguard Total International Stock Index Fund ETF 3. BND - Vanguard Total Bond Market Index Fund ETF