Some keys can do many things:
1.Don't use c$
C, Delete from the cursor position to the end of the line.
2.Don't use cl
s, Delete [count] characters [into register x] and start insert (s stands for Substitute).
3.Don't use ^s
S, Delete [count] lines [into register x] and start insert.
4.Don't use ^i
I, Insert text before the first non-blank in the line [count] times.
5.Don't use $a
A, Append text at the end of the line [count] times.
6.Don't use A<Enter>
o, Begin a new line below the cursor and insert text, repeat [count] times.
7.Don't use ko
O, Begin a new line above the cursor and insert text, repeat [count] times.