Insert mode
Insert mode is where text entry happens.
The simplest way in is the i key from normal mode: it starts inserting
before the cursor. Once you’re in, every key types a character, just like the
editors you’re used to. When you’re done, Escape drops you back to normal
mode.
Watch the statusline while you do it — NOR becomes INS the moment you
press i, and flips back when you leave.
This is the rhythm of modal editing: dip into insert mode, type, come back home. Work through the checklist below to try it out.