I want to start trading , should i buy Bitcoin or Etheureum first ?
before you start trading and choose one of them, you should first understand the basic of trading and understand first about bitcoin and ethereum. it is important to avoid losses later. but if you already understand this, I suggest to choose bitcoin because bitcoin is the parent of all altcoin
Good advice, being a beginner you should start in one coin and slowly going to other when you think you are ready or your mind can pick up the new lessons that you are about to know experience. Bitcoin is the formost basic crypto that you should know better than any crypto.