How to start building websites to become a good frontend developer?

Question

Layout

Hello everyone, this is my first time here, so I ask you to be patient (the question is not so formulated, the tags are not the same, etc.).
A little about myself:
I study html, css, js at the same time (I don’t have a full-fledged practice, except for step-by-step guides on website layout)
I want to become a frontend developer.
I understand that a coder and a frontend developer are somewhat different things. In my understanding, a coder is the first step in the evolution of a frontender (correct me if I'm wrong), because everywhere in vacancies and on forums they write that a frontender should know css and html. Questions:
1) How good should a front-end developer be at layout? (just understand the tags, or, for example, a senior frontend developer should be able to create websites of any complexity using frameworks and other cool technologies)
2) Is it worth it to learn technologies like Flex-box and css-grid before creating the first layout, or do you need to fill bumps on pure css and html first?
3) Regarding adaptive layout, by what means is adaptability achieved (apart from media queries)?
4) Css frameworks how widely they are used by professional companies? I heard such an opinion that bootstrap and others create simple template sites, and they are useless for a professional, because. limit his freedom of action, right?
I would be immensely glad for any advice, it would be especially nice to hear the opinion of experienced developers from this area, thanks in advance!

Answer 1

My experience shows:
1. On the one hand, you need to make up complex layouts so that they are cross-browser, but on the other hand, so that it is easy to pull this layout later. I had to see a plate with a discount, where the discount itself was written in the styles as a pseudo-element. Of course it was not long to remake, but still. Or here is a similar color choice in the filter from a layout designer: https://yadi.sk/i/tgr8M-ZjH-wj-g
2. Flex-box and css-grid are not such direct technologies that take months to learn. It is enough to set aside a day in the sandbox to try what it is and when it needs to be used, so as not to shove it where it is not necessary.
3. media requests are enough
4. Depends on the company, on the goal, on the cost of the project, on the development time
But I could be wrong, other people's opinions are interesting.

Answer 2

I will be immensely grateful for any advice.

I advise you to learn to google
UPD. Taken from the comments:
I translate into Russian: "I do not know how to understand what I read."
Well, then there is nothing to climb into development. Drink beer, watch football.

Answer 3

1) How good should a front-end developer be at layout? (just understand the tags, or, for example, a senior frontend developer should be able to create websites of any complexity using frameworks and other cool technologies)

It is enough to be good at typesetting and know the approaches of client-side optimization

2) Is it worth learning such technologies as Flex-box and css-grid before typing the first layout or do you need to fill bumps on pure css and html first?

grids and flexes - pure css. What is there to learn is unclear.
You need to type immediately and a lot

3) Regarding adaptive layout, by what means is adaptability achieved (apart from media queries)?

none. And those who make adaptability on zhs will burn in hell

4) Css frameworks how widely they are used by professional companies? I heard such an opinion that bootstrap and so on create simple template sites, and they are useless to a professional, because. limit his freedom of action, right?

Do you create a different browser for each site from 0? Not?
What is the problem then to take a bootstrap and make a sane template in 10 minutes.
What is the problem in making a new browser for the site if you were given a budget for it and unlimited time?