How about, "Is it important to learn idioms in English?" I think you should learn the meanings of them as they come up, but I would not worry about using them as native speakers do. I certainly wouldn't memorize long lists of them. If you use idioms, you have to use them perfectly. Any mistake, no matter how small, sounds really bad to the native speakers ears. Also, you have to know the exact situations idioms are useful. If you use them in the wrong situation, it can be embarrassing. You can actively learn those that you feel comfortable with and passively learn those that you like / understand. Take all of that time you save and put it towards learning phrasal verbs instead. You can get a lot more mileage out of phrasal verbs and they add fluency to your speech without the flatness of overused phrases that can become outdated and don't really add a lot to your communication.

I think awareness of different idioms is a very necessary part in one's English learning progress. It will make your English more live and closer to native speakers'. I even heard that a native speaker of English is more likely to say "to put out a fire" than "to distinguish a fire", that means they prefer idioms over anything else. I think when you get to the point of intermediate level you can't really go higher if you don't start using idioms.

Native speakers often use them, so it's important for you to learn some of them too. for better understanding ^_^

Very often we use idioms in our own language. From my point of view, idioms can make your English more natural and interesting. Without idioms your English will'be as dull as ditch water. It's a peace of cake to learn it.