Paired writing during use of VIM

I think Vim is quite good. I don't need to use the arrow keys. Basically, I don't need to move my hands. I just need to move my fingers.

1, but one thing is thatProgramUsually, it is a pair write () or {}. After the pair is written, return to the center of the brackets. The method I use is to first ESC, then I, or add a few more H and l keys. at first, I thought it was complicated, but I didn't know any other methods. if anyone knows a better method, I hope I can tell you.

2. In command mode, a starts writing at the next position of the current character. A starts writing at the next position of the character at the end of the current line.

3. In command mode, DD deletes the current line, and X deletes the current character.

4. combination of numbers and commands, to the end of the file g, to the nth line of the file ng.