Help with some book titles 重生之妙手医心


  I don't get this because of "妙手医心."  What does it mean?  A wonderful hand and a doctor's heart?


大哥这种生物，少惹为


  What is "少惹为?"  


魔天记


  Is it "devil's diary?"
妙手: magic hands is a metaphor for skilled person (painter, writer, doctor, etc). There is a phrase '妙手仁心' magic hands and kind heart which is used to praise good doctors. '妙手医心' means the same. 

少惹为: you're missing a character, it should be 少惹为好 er 少惹为妙, meaning the less provocation the better. The whole sentence means better not provoke the boss.

魔天记: 魔 generally means devil, 天 means sky or heaven, 记 means diary or story. Without reading the book (suppose it is a book), the exact meaning of 魔天记 isn't clear even in Chinese.