People seems to forget the power of CSS. If you can’t remember how CSS selectors exactly work and why the cascading part is so important, go and improve your CSS skills using CSS Diner. You’ll have 32 levels to go through and solve every challenge by writing the correct CSS selector:
I’m really bad at remembering emoji’s. So here is cheat sheet with all emoji’s that can be used in tools that support the github emoji markdown markup: All credits go to rcaviers who created this list.