といった

The expression といった + X is used to present examples of X, where the examples are listed before the といった portion. It's similar to the phrases などの Noun and のような Noun, though といった can be preceded by nouns, nouns phrases, and entire sentences. It can generally be read as "like" or "such as."

日本語が上手に話せるようになるには、丁寧な話し方やくだけた話し方、敬語といったスピーチレベルが違う話し方の練習もしなければならない。
To reach a point where you can speak Japanese well, you must also practice the differing types of speech, such as polite speech, casual speech, and keigo.

リーさんの家では犬、猫、ねずみ、蛙といった動物がたくさん飼っていますね。
At his house Lee-san has lots of animals like dogs, cats, mice, and frogs.

どの国の言葉でも、丁寧になればなるほど文が長くなるといった傾向がある。
No matter the language, there are tendencies such as the more polite you get, the longer a sentence becomes.

娘さんは野菜や果物や肉といった食べ物が食べられるんだよ。
His daughter can eat foods like vegetables, fruits, and meat.