It took a while, but I’m finally quite comfortable using Adobe Illustrator. In this word of high resolution devices, it’s nice to have a program that isn’t locked into pixels.
One favorite feature that cropped up over the past few years is Artboards, where you can create multi-page documents. Even better? I doodle outside of these canvases, in the digital margins so to speak, keeping iterations and ideas not used. Sometimes I even keep it tidy.