Помогите , пожалуйста , когда употребляется who. а когда that .

caring person with good communication skills. Since my childhood I have wanted to be either a nursery school or primary school teacher. These careers require further study after Year 11. So I am taking A levels in English, drama and IT* at college. I also take part in the college events —this is something pos-itive that I can write in my CV together with my work experience. I helped in both a nursery and a primary school. I thought it would allow me to develop both my key skills and my personal qualities. I asked the people who I worked with what qualifications they had done. They talked to me about the good aid bad aspects of the job of a teacher and what they liked about it. It is hard work but it allows you to fee] personal achievement, to feel respect, besides the salary is good. I liked to belong to a team and my work helped me to improve my confidence and to get the skills that I need for higher education or employment. Now I plan to go on to higher education after college. But if I decide to cliaiige any career in the future, I am certain that neither my skills nor experience will be useless to me.
По тексту ответить на вопросы:

What does Layla want to be a teacher?
What skills does she have?
What is necessary for a teaching career?
Has She got any work experience?
What did she do? Did she like it?
What did she expect from her work experience?
Was it useful?
What did she learn from the people she worked with?
Are there any good and bad aspects of the job of a teacher?
What is she going to do to achieve her career goals?

Помогите, пожалуйста, срочно нужно.