Get started with Vim directly (2): Common commands (enter input mode, move cursor, text operation)

command mode

Enter input mode for text editing

i is insert to insert characters before the cursor, a is append is to append characters after the cursor.
o is used to start a new line, the difference between upper and lower case is up, down, left and right, you will know it by trying it yourself.
r is used to replace characters. Lowercase replaces one, uppercase can replace many.

Move cursor operation

text manipulation

Bottom Line Mode

Reference: bilibili