Nuance and politeness
Comparison
Compare things: more, better and the best.
The describing word doesn't change. Where English says cheaper or more expensive, Thai adds กว่า after the word: แพงกว่า, more expensive. There's no -er ending and no separate word in front.
quality+กว่า+what it's compared with
This one is more expensive than that one.
This restaurant is the best.
I like tea more than coffee.
Common mistake
ที่สุด goes after the describing word: ดีที่สุด, the best. Thai has no word for the most that goes in front, as English most does.
Practise
Kai says
กินข้าว literally means eat rice, but it's also an everyday way to talk about having a meal. A word-for-word translation doesn't always tell the whole story.