Every project the frontend guys talk about Javascript frameworks, Vue, React, Angular, and others. What are they and why are they used instead of plain Javascript?

Everyone talks about webhooks and it became a buzzword. So is it just a simple HTTP request or are there some other specifics?

I heard the word "hydration" at a conference once and everyone seemed to know exactly what it is, but me.

On average I work with JSON data 18 times a week. And I still need to google for specific ways to manipulate them almost every time. What if there was an ultimate guide that could always give you the answer?

We all know we should write unit tests. But, it's hard to know where to start and how much time to devote to tests compared to actual implementation. So, where to start? And is it just about testing code or do unit tests have other benefits?