Here is a list of Apps and tools that I use in my daily workflow as a Graphic Designer and Front-end Developer.
Unless a significant percentage of your target audience use browsers that do not support CSS grid, you should opt for the simplest fallback layout.
How to create/save transparent PNG files in Affinity Designer
An easy to follow tutorial on creating a multi-column magazine layout using CSS grid. I walk you through using the power of css grid, with the help of a few css properties.