Hello Alberto. Phrasal verbs are very important in English conversation. Here is a website that can help you with them http://www.englishpage.com/prepositions/phrasaldictionary.html

Phrasal verbs are absolutely vital in common English. In fact, if I want to explain something in a simple way to another native English speaker, I use phrasal verbs. I realise they may be very unfamiliar to English learners, but please don't dismiss them because they seem "too hard". Good luck, and have fun!