What engine is used to make cool landing pages?

Question

CMS

Maybe I didn't formulate the question correctly. I would like to learn how to make cool landing pages, like big and not so big companies. I tried to do it on Bootstrap, downloaded templates - not quite what you need is obtained.
I read on the Internet about some special engines for beautiful presentation landings. What kind of engines are these?
Tell me which way to google. Throw off some useful information in technical terms. How to layout landing pages correctly? What are the engines? Maybe you know some cool examples of landing pages or agencies that create landing pages? Very interesting.
And if it's not difficult - write your TOP mistakes when creating a landing page (or in general when making layout) that you had to make.

Answer 1

html css js - any degree of coolness can be done.