"The girl likes cookies."

Translation: Dziewczynka lubi ciasteczka.

[Yup9317]

Its so hard to remember all the different lubi-'s

[alik1989]

Not to mention all the other thousands and thousands of Polish verbs. If only there were a pattern of some sort...

[Lex606117]

Was that sarcasm and there is a pattern or you're jest stating the obvious

[Jellei]

There are several patterns, but you will start seeing them in some time.

[JudyWorth0]

Seems like ka at the end of a word means small or diminuative

[immery]

You are partially right, it means diminutive, and diminutive often translates to "small" in English,
but it's dziewczyna -> dziewczynka

and ciasto-> ciastko-> ciasteczko in nominative singular form and o changes to a for plural (and accusative=nominative for neuter nouns)

https://pl.wikipedia.org/wiki/Zdrobnienie#Formanty_o_podstawie_-k-