Learn Portuguese (Portugal): Quero conhecer o teu amigo.

When you use a verb like querer (to want) followed by another action, only the first verb changes to match the person doing the action (Quero = I want). The second verb stays in its infinitive form (conhecer), similar to how we say "to meet" in English.

I thought conhecer meant "to know". Why is it translated as "to meet" here?

Conhecer generally means "to know" when talking about being familiar with people or places. However, when you are talking about getting to know a person for the first time, it translates as "to meet". If you wanted to say you are meeting up with a friend you already know, you would use a different verb, encontrar.

Why is there an o before teu amigo? Doesn't teu already mean "your"?

Yes, teu means "your". But in European Portuguese, you almost always put a definite article (o, a, os, as - meaning "the") before a possessive word. Because amigo is a masculine singular noun, we use o teu amigo (literally: "the your friend").

Where is the word for "I" in this sentence?