Being a front-end engineer, I have to deal with a lot of layouts and components.
There are a lot of CSS frameworks out there that provide popular layouts and components but I usually don't want to include entire framework in my project because
For each project with different requirements, I often google for the most basic part of particular layout or UI pattern and build up from there.
So I collect most popular layouts and components that can be built with pure CSS. They are powered by modern CSS features such as flex box and grid.
They are great starting points to be picked and customized easily for each specific need. By composing them, you can have any possible layout that exists in the real life.
It helps me a lot and hopefully it will help you!
The entire website is open source, so let's explore and give me one Github star :)