Good design, color combinations?

Question

Design

Please tell me how important it is to follow the rules of color combinations and is it possible to make a site to your taste, if I want to visit and that others would like the site?
Let's say I want to combine colors such as:
black, red, yellow, white.
Would it be right to make a smooth transition? Or is it possible to make a block red, next to black and yellow?

Answer 1

There are no clear rules about colors and never have been, but there are some theories regarding the perception of color. To understand how to build colors correctly, I would recommend getting acquainted with the theory of how a person reacts to color, here you can read excellent articles:
https://habr.com/ru/post/202966/
https://habr.com /ru/post/209738/
https://habr.com/ru/company/SECL_GROUP/blog/316938/
Now that you know how people perceive colors, you need to read about how to use them in graphics, for this there are cool Books:
Johannes Itten. “The Art of Color”
Bride Willen “Harmony of Color”
I think this base will be enough for the first time to give an approximate answer to your question.

Answer 2

There is no free solution of this level (or I have not seen it). In general, BIND / PowerDNS / etc is enough to set up delegation of subdomains and billing to manage the DNS zone.
site.domain.com will be a separate subdomain delegated to third party ns servers. However, it should be borne in mind that a lot of DNS traffic will go to the ns-servers of domain.com itself, it makes sense to place them in the cloud.