What JS-Framework makes the most sense?

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Digging deeper into JS I'm also musing about what JS-Framework may make the most sense!?

”Most sense" means:

• What is easy to learn?

• What does not have dependencies?

• What is currently the most popular one?

 

So may I ask around:

1) What is the JS-Framework you're using?

2) Why?

3) What are the Pros and Cons (if that's different from 2)