Chapter 3

Question 1

What zz command does

Answer 1

Centre line under cursor on the screen

Question 2

What in insert mode does

Answer 2

Switch to Insert Normal mode

Question 3

What {register} in insert mode does

Answer 3

Switch to Operator waiting mode, that waits you to enter yank register name so it could paste the value of that register

Question 4

What {register} in insert mode does

Answer 4

Switch to Operator waiting mode, that waits you to enter yank register name so It inserts text literally and fixes any unintended indentation

Question 5

What = special register in insert mode does

Answer 5

It puts you into expression evaluation mode, where you can do math and other vim script stuff

Question 6

What [u]{code} in insert mode does

Answer 6

In insert mode It insert a character by code. If you use [u] option it would treat the code hex way. If the code is any character, than it past literally, meaning that if you set up expand to some value this command would paste real instead

Question 7

What {char1}{char2} in insert mode does

Answer 7

Insert character represented by {char1}{char2} digraph