Phrasal verbs are verbs and prepositions that are used together e.g. put up = means to give somewhere to stay overnight.
Often the verb and preposition have meanings that are difficult to understand. You should learn and remember them because they are an important part of the English language.
I recommend the ebooks at phrasalverbsinbritain to help you with this if you are pre-intermediate level and above. If you go to the website you can download a free sample with audio for pronunciation.
If you are elemntary level, it is useful to get some flashcards to help you remember some of the easier ones.
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