Huh ? What video are you talking about ? What video is everyone doing ?
1: Reading because it helps you remember the key subjects as in nouns adjectives and more. Also because when you see a more complicated word you can always look around the word to see what it means and use it in your studies!
2. To concentrate on what your English teacher is saying so you will get better grades.
"The black cat" black is the adjective its describing the cat which is the noun