Please suggest which CSS framework is the best, and resources to learn CSS.
And for CSS, you can do quite advanced stuff without using any library or framework.
The basics are very easy to learn compared to Python. I would think you should be able to pick it up very quickly.
Some of the best online resources are probably:
* Mozilla Developer Network online documentation (https://developer.mozilla.org/en-US/docs/Web/CSS)
* w3schools (https://www.w3schools.com/css/)