first day of work

At first, my bad boss sent a chart to me, and i was advised to learn some new skills. We should hold a meeting at 3:00 pm today, it was canceled for some reason. secondly, i am writing something in this new website in order to use it proficient. For this website, i guess it may be a pirated website used for practicing product page articles. i have a question now, what does html mean ？Finally, the weather isn’t good, i wanna go play outside.