Have you never used a keyboard before? Like the indicator light of ordinary keyboard, the first one is Num lock, which can only be used when the keypad is above keypad 7; Capitalization lock, capital letter lock key, move left to the top, and the letters will be capitalized after lighting; The scroll lock (above the Home key) is a function key on the computer keyboard. After pressing this key, when Excel and others press the up and down keys to scroll, the cursor will be locked and the page will scroll. If this key is released, when the up and down keys are pressed, the cursor will scroll without scrolling the page.