WHAT IS HTML AAAAAAAHHHH

IM SO STRESSED. YES, I AM HAVING A GREAT TIME, BUT I WANT TO START EATING MY FUCKING KEYBOARD!!!!!!

HOW DO YOU. HOW DO I MAKE A DROP-DOWN MENU. HOW DO I DO IMAGES AND GIFS AND MAKE BACKGROUNDS. 

AAAAAAGAHAGHAGVUJWVHVUHVIUHCHUJDUJDVURVRVJNERLKGBB!!!!!!!!!!!!