The website grid is a system for organizing the content on the page and creating alignment and order. It forms the basic structure of your user interface
Figma Tutorial: Layout Grids
Website Grid Design: Guide
Responsive layout grid guide for designers, by Oriol Banus
Create layout grids with grids, columns, and rows – Figma Learn - Help Center
How to use grids in web design: 5 golden rules
6 Rules for Creating Grid Layouts in Web Design
Grids and Layout from The Futur
Responsive CSS Grid: The Ultimate Layout Freedom. A 5 minute tutorial for UX/UI Designer & Developer
The Grid System: Importance of a Solid UX/UI Layout
Responsive grids and how to actually use them, by Christie Tang
The Grid System: Building a Solid Design Layout
How to use grids in web design: 5 golden rules
6 Rules for Creating Grid Layouts in Web Design
Basic concepts of grid layout - CSS: Cascading Style Sheets