Importing and Vectorizing

I don’t understand the vectorizing function at all and when I’ve played with it I don’t get images anywhere near what they should be.

For example, I had a simple phrase created in MS Paint of white letters on a black background. I imported it and vectorized it so that I could alter and move it and it created these really jagged outlins of the letters which I had to clean up and then repaint.

Later I tried a picture, jpg. I vectorized it and it removed all features of the person and had it in total B&W outline - while it looked really cool, it wasn’t what I wanted. I need to bring images in and make them alterable (is that a word?)

I’m not getting any help with understanding what the different options in the vectorize section really do and the docs do go into any detail.

Anyone understand this stuff?