Default Xperia E single SIM short of memory

Guys I have xperia e c1504. I don't know even R of rooting. I can't install apps on my phone because it says phone memory low plz could somebody tell me simple step by step method to root. I am also scared because this is my only phone so if I brick it I won't get another. Please tell the steps here only if possible because I didn't understand a word at other forums???plzzz help guys I'll be very grateful

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