Sort and kind have some meanings that are the same, and some meanings that are not.
I sort of like that and I kind of like that... same meaning.
That's sort of nice, that's kind of nice.... same meaning.
That sort (or kind) of behavior will not be tolerated.... same.
I will sort the laundry ... different.
Please be kind to her ... different.
Sort and kind have quite a few definitions and are both very common words used in lots of expressions, so you will have to get to know them over time.