If you wanna make your models smoother and more polished, try right clicking on them, selecting Shade Smooth, then left click on the model, click the blue wrench, click Add Modifier, then click Subdivision Surface. If your computer lags with this on, click on the computer icon so it won't appear in the viewport and only in the rendered product.

If you're working on a FNATI model with a base, and want to add holes into the model, and you're doing it by removing random vertices from a model, try adding a Solidify modifier to make the holes have more depth. And Subdivision Surface to make em smoother.