Phrasal verbs are very common in English. They can be confusing because their meaning is often quite different from the meaning of the main verb.
For example, When you look at something, you see it. When you look up something, you try to find information about it.
On the English Club website, you can study a new phrasal verb every day. They include some example sentences, plus a little quiz to see if you understand. You can also look at a list of 200 common phrasal verbs.