Factor betas can be used in the process of hedging idiosyncratic risk, but they cannot be used in hedging systematic risk.

Choosing the frequency to adjust factor-based hedges requires making a decision that balances the hedging cost and the tracking error.

Factor hedging performs well when linear factor models are used, but performs poorly when nonlinear factor models are used.

While an investor can take positions in factors to construct a portfolio with a beta close to zero, the investor cannot theoretically construct a portfolio with a beta exactly equal to zero