Which is?

Here[1], you can learn about it. It's simple, but not easy.

For me, it means buying Fidelity 0 funds in a Roth IRA and not selling them.

[1]https://www.bogleheads.org/wiki/Bogleheads%C2%AE_investment_...

Autoinvest diversely and don't sell. Minimize transactions. Never invest based on the news.