For example, the clinking glasses, the fireworks, and the firework rocket. They always have a nice symmetry, they're obviously not drawn with some kind of brush tool, and they don't just use basic shapes. Are they really just made with Adobe Illustrator or something?
Is there a specific name for that kind of vector image I can search for, or a tutorial to make that kind of thing or anything, something like that? I tried Illustrator once and I was lost and confused, I looked up tutorial but I couldn't find anything on how to make vectors like the ones seen in the above image.
(Since we're on the topic of the image, I've also always wondered how you make or generate images like in the background...)