# heteroskedasticity OLS model prediction

I am making an OLS model. Firstly, I want to confirm that checking heteroskedasticity. How to check the presence of heteroskedasticity? Is it just plot resid against independent variables, right?

Secondly, If the model does have heteroskedasticity, does it impact this OLS model prediction?

1. You can also statistically test heteroskedasticity (e.g., White's test: regress squared residuals from OLS on $\hat{y}$ and $\hat{y}^2$, or if you have a simple model, regress $\hat{u}^2$ on $x$ and $x^2$).