This is my personal opinion and I don't force anything on you.
So be calm and keep learning.
- Writing Regex
- constructor functions
- Reduce function of Arrays
And a lot more which would certainly help in my career.
Almost nothing, apart from a little amount of time which I would call an investment rather than a loss.
It's obvious. My suggestion is to check freecodecamp.org and similar sites, especially if you are a beginner and never been there. Even if you are not a beginner, who knows, you might just stumble upon something new and that might help in your career.
Its never bad to discover things.