Here's an SVG that works as a functioning calendar
well for everyday's tasks when you're making a new website , sometimes you want to make a complicated shape, so you try to do it with css (:after , :before and tricks here and there) which can be easily implemented with svg which will be responsive as well and it won't ruin the whole page on a different viewport.
you can watch these awesome talks about svg by the amazing Sarah Drasner , Sarah Soueidan and others
I use in a multi tenant webchat, usually each tenant has it's colours with svg I can override fill property and customize easily any icon.
Taking notes can help you remember what you learn and be a log of your past learnings!