Is it correct to use ready-made libraries in projects?

Question

css

Hello coders! I would like to ask you a question: is it correct to use ready-made plugins in your projects? I'm a beginner, I've been learning layout for about 5 months, and now I'm sitting on JavaScript. What confuses me a little is that I can write most of my solutions only in JQuery, and I also use ready-made plugins. And as a result of this, I wondered: is this normal? Some argue that customers do not care how you did the work - the main thing is the result. Others say that for professional growth, in any case, you will need to be able to write your own sliders (for example), and I completely agree with this. But still, just to make money on the layout of sites, are there enough plugins, or is it worth learning how to do everything yourself before going to the market?

Answer 1

right, but what would you understand:
1. jQuery is a library
2. slick slider is a plugin
with their help you made a slider image slider as the customer wanted in 3 minutes and is satisfied
...
seconds passed ... minutes ... hours
...
the customer asked you for additional. a fee to make a preview of images to the slider
, so that you don’t get into a puddle, you need to know how it works
and this is 1cm of an iceberg, further - deeper

Answer 2

And as a result of this, I wondered: is this normal?

This is a meaningless question. Norm is an abstract concept. The right question is: what are the pros and cons of this approach. For example:
Pros:
- Reduced development time
- Code is more readable and easier for further support
Cons:
- Increased page volume
And if using the library reduces development time by a significant enough time, then you can use it.