How to make your own layout grid or how not to write repetitive code from project to project?

Question

css

Hello everyone, who can advise, I’m not the first to make up the layout, and every time I write almost all the html css anew, that is, all containers, all styles, I can start using some kind of grid or create my own, but is it necessary?
It’s just that from project to project it’s hard to write everything anew every time, I write projects for myself.
I'm not a fan of any bootstraps, I don't offer))) I only use normalize.css I
can write my own simple grid and do projects on it, but how to write it and where to look for information, in general, who does it?

Answer 1

Discover css preprocessors and pull out only the grid from the same unloved bootstrap, and edit it as you like

Answer 2

If you are already familiar with flexbox, then you can quickly get acquainted starting from here: https://www.youtube.com/watch?v=FLbvUFVr3bg and then googling.

Answer 3

An example of the implementation of a grid 3 columns on floats
https://www.w3schools.com/howto/howto_css_three_co...