'H' goes to the beginning of the line, 'L' to the end.

'w' moves forward by a word. 'b' moves backward by a word.
'W' moves to end-of-word. 'B' moves backward to end-of-word.

'I', 'F' and 'E' invoke the corresponding command from the
Block Editor (B100). Refer to documentation there.

'X' deletes "modifier" characters following cursor.

'R' goes into replace mode at current cursor position.
Following keystrokes replace current character and advance
cursor. Press return to return to normal mode.