Hi. This question, or a variation like, “Tell me about yourself” is used in over 75% of interviews as the first question. It’s critical that you have a good answer, as it is how you will form your first impression and can serve to guide the interview. It’s a whole topic deserving a long discussion, best had with a job search coach who can help you build a powerful answer, but here are some general tips. Focus on your professional and educational achievements. Only bring personal info in when it’s relevant to those topics. Structure it in a “present, past, future” sequence. What you’re doing now, how you got here, where you want to go next in your career. Keep it short, about 2-3 minutes. As in the whole interview, keep your focus on how you can help the company that is interviewing you. They don’t want to hear about you; they want to hear how you can help them. Talk about your accomplishments that relate to the job you are seeking. I hope this helps.

I think they want to know about your professional skills and about your confidence (why they should hire you). So you could also tell them about your personal skills to help you get the job done.

Really I also would practice in this matter

Hi, my name is X and I’m going to talk about my job skills or what I’ve studied and why I’m interested in this job. Also, “doubt” have a little negative meaning so I rather use “questions” instead . Em português podemos falar de boa “eu tenho dúvidas sobre esse trabalho” mas em inglês soaria meio como se tivesse desconfiada que os empregadores seriam do mal se você disser “I have / Im in doubts about this job” . Então o ideal seria dizer “I have questions about this job / I’m not sure how is this job “ :)