She has tried several different jobs before she decided to become a full-time writer. Why not "had tried" or just "tried"? Is the present perfect tense the best choice here?

Understanding the Context

My first thought was "had tried". Which one of the following is correct in the following context? Why Islamabad and How it is different? Why Islamabad and How is it different?

Key Insights

P.S. Islamabad is the capital city of Pakistan. Thanks! How it is different or How is it different? - WordReference Forums It was "They had to change TV channels on different days at different times".

Final Thoughts

I read "in different days" could be correct too, I don't know. Thank you in advance for your help too. #1 Hello, 1. I like to work with people of/with different ages. 2. I like to work with people of /from different cultures.

3. I like to work with people of/with/from different backgrounds. 4. I like to work with people of/with/from different occupations.