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+# TextEditor Feature Checklist
+
+## Normal Mode Motions
+
+### Basic Movement
+- [x] `h` - Move left
+- [x] `j` - Move down
+- [x] `k` - Move up
+- [x] `l` - Move right
+
+### Word Movement
+- [x] `w` - Forward to start of word
+- [x] `e` - Forward to end of word
+- [x] `b` - Backward to start of word
+- [ ] `W` - Forward to start of WORD (whitespace-delimited)
+- [ ] `E` - Forward to end of WORD
+- [ ] `B` - Backward to start of WORD
+- [ ] `ge` - Backward to end of word
+
+### Line Movement
+- [x] `0` - Move to start of line
+- [x] `$` - Move to end of line
+- [x] `_` - Move to first non-whitespace
+- [ ] `^` - Move to first non-whitespace (alias for `_`)
+- [ ] `|` - Move to column N
+
+### File Movement
+- [x] `G` - Move to bottom of file (or line N with count)
+- [x] `gg` - Move to top of file (or line N with count)
+- [ ] `H` - Move to top of screen
+- [ ] `M` - Move to middle of screen
+- [ ] `L` - Move to bottom of screen
+
+### Scroll
+- [x] `ctrl+u` - Scroll up half page
+- [x] `ctrl+d` - Scroll down half page
+- [ ] `ctrl+b` - Scroll up full page
+- [ ] `ctrl+f` - Scroll down full page
+- [ ] `ctrl+y` - Scroll up one line
+- [ ] `ctrl+e` - Scroll down one line
+- [ ] `zz` - Center cursor on screen
+- [ ] `zt` - Scroll cursor to top
+- [ ] `zb` - Scroll cursor to bottom
+
+### Search Movement
+- [ ] `f{char}` - Find char forward on line
+- [ ] `F{char}` - Find char backward on line
+- [ ] `t{char}` - Till char forward on line
+- [ ] `T{char}` - Till char backward on line
+- [ ] `;` - Repeat last f/F/t/T
+- [ ] `,` - Repeat last f/F/t/T reversed
+- [ ] `/` - Search forward
+- [ ] `?` - Search backward
+- [ ] `n` - Next search result
+- [ ] `N` - Previous search result
+- [ ] `*` - Search word under cursor forward
+- [ ] `#` - Search word under cursor backward
+
+### Other Movement
+- [ ] `%` - Jump to matching bracket
+- [ ] `{` - Jump to previous paragraph
+- [ ] `}` - Jump to next paragraph
+- [ ] `(` - Jump to previous sentence
+- [ ] `)` - Jump to next sentence
+
+---
+
+## Operators
+
+### Implemented
+- [x] `d` - Delete operator
+- [x] `y` - Yank operator
+- [x] `dd` - Delete line (double press)
+- [x] `yy` - Yank line (double press)
+
+### Not Implemented
+- [ ] `c` - Change operator
+- [ ] `cc` - Change line
+- [ ] `>` - Indent right
+- [ ] `<` - Indent left
+- [ ] `=` - Auto-indent
+- [ ] `gq` - Format text
+- [ ] `gu` - Lowercase
+- [ ] `gU` - Uppercase
+- [ ] `g~` - Swap case
+- [ ] `!` - Filter through external command
+
+---
+
+## Actions
+
+### Insert Mode Entry
+- [x] `i` - Insert before cursor
+- [x] `a` - Insert after cursor
+- [x] `I` - Insert at start of line
+- [x] `A` - Insert at end of line
+- [x] `o` - Open line below
+- [x] `O` - Open line above
+- [ ] `s` - Substitute character (delete + insert)
+- [ ] `S` - Substitute line (delete line + insert)
+- [ ] `C` - Change to end of line
+- [ ] `gi` - Insert at last insert position
+
+### Delete Actions
+- [x] `x` - Delete character under cursor
+- [x] `D` - Delete to end of line
+- [ ] `X` - Delete character before cursor
+- [ ] `J` - Join lines
+- [ ] `gJ` - Join lines without space
+
+### Yank/Paste
+- [x] `p` - Paste after cursor
+- [x] `P` - Paste before cursor
+- [ ] `gp` - Paste after and move cursor to end
+- [ ] `gP` - Paste before and move cursor to end
+
+### Registers
+- [x] Unnamed register (`"`)
+- [x] Numbered registers (`0-9`)
+- [x] Register types (charwise, linewise, blockwise)
+- [ ] `"` - Register prefix (select register for next operation)
+- [ ] Named registers (`a-z`)
+- [ ] Append to named registers (`A-Z`)
+- [ ] Black hole register (`_`)
+- [ ] System clipboard (`+`, `*`)
+- [ ] Expression register (`=`)
+- [ ] Last search register (`/`)
+
+### Undo/Redo
+- [ ] `u` - Undo
+- [ ] `ctrl+r` - Redo
+- [ ] `.` - Repeat last change
+- [ ] `U` - Undo all changes on line
+
+### Other Normal Mode
+- [ ] `r{char}` - Replace character
+- [ ] `R` - Replace mode
+- [ ] `~` - Swap case of character
+- [ ] `ctrl+a` - Increment number
+- [ ] `ctrl+x` - Decrement number
+- [ ] `q{reg}` - Record macro
+- [ ] `@{reg}` - Play macro
+- [ ] `@@` - Repeat last macro
+- [x] `ctrl+c` - Quit (custom)
+
+---
+
+## Visual Mode
+
+### Mode Entry
+- [x] `v` - Character-wise visual mode
+- [x] `V` - Line-wise visual mode
+- [x] `ctrl+v` - Block-wise visual mode
+- [ ] `gv` - Reselect last visual selection
+
+### Visual Mode Operations
+- [x] Motions work in visual mode
+- [x] `d` / `x` - Delete selection
+- [x] `y` - Yank selection
+- [ ] `c` - Change selection
+- [ ] `>` - Indent selection
+- [ ] `<` - Unindent selection
+- [ ] `=` - Auto-indent selection
+- [ ] `~` - Swap case of selection
+- [ ] `u` - Lowercase selection
+- [ ] `U` - Uppercase selection
+- [ ] `J` - Join selected lines
+- [ ] `o` - Go to other end of selection
+- [ ] `O` - Go to other corner (block mode)
+
+---
+
+## Insert Mode
+
+### Text Input
+- [x] Character insertion
+- [x] `Enter` - Insert newline
+- [x] `Tab` - Insert tab/spaces
+- [x] `Backspace` - Delete character before cursor
+- [x] `Delete` - Delete character under cursor
+- [x] `ctrl+w` - Delete word before cursor
+
+### Movement in Insert Mode
+- [x] Arrow keys (up/down/left/right)
+- [ ] `ctrl+h` - Backspace (alias)
+- [ ] `ctrl+j` - Insert newline (alias)
+- [ ] `ctrl+t` - Indent line
+- [ ] `ctrl+d` - Unindent line
+
+### Exit Insert Mode
+- [x] `Esc` - Exit to normal mode
+- [ ] `ctrl+c` - Exit to normal mode
+- [ ] `ctrl+[` - Exit to normal mode
+
+---
+
+## Command Mode
+
+### Entry/Exit
+- [x] `:` - Enter command mode
+- [x] `Esc` - Exit command mode
+- [x] `Enter` - Execute command
+
+### Editing
+- [x] Character input
+- [x] `Backspace` - Delete character
+- [x] `Delete` - Delete character
+- [x] `ctrl+w` - Delete word
+- [x] `Left` / `Right` - Move cursor
+
+### Commands Implemented
+- [x] `:set number` / `:set nonumber` - Toggle line numbers
+- [x] `:set number!` - Toggle line numbers
+- [x] `:set tabstop=N` - Set tab width
+- [x] `:register {name}` - Show register contents
+- [ ] `:w` - Write file
+- [ ] `:q` - Quit
+- [ ] `:wq` - Write and quit
+- [ ] `:q!` - Force quit
+- [ ] `:e {file}` - Edit file
+- [ ] `:bn` / `:bp` - Next/previous buffer
+- [ ] `:{range}` - Go to line
+- [ ] `:%s/old/new/g` - Search and replace
+- [ ] `:!{cmd}` - Run shell command
+- [ ] `:help` - Show help
+
+---
+
+## Text Objects
+
+### Not Implemented
+- [ ] `iw` / `aw` - Inner/around word
+- [ ] `iW` / `aW` - Inner/around WORD
+- [ ] `is` / `as` - Inner/around sentence
+- [ ] `ip` / `ap` - Inner/around paragraph
+- [ ] `i"` / `a"` - Inner/around double quotes
+- [ ] `i'` / `a'` - Inner/around single quotes
+- [ ] `` i` `` / `` a` `` - Inner/around backticks
+- [ ] `i(` / `a(` - Inner/around parentheses
+- [ ] `i[` / `a[` - Inner/around brackets
+- [ ] `i{` / `a{` - Inner/around braces
+- [ ] `i<` / `a<` - Inner/around angle brackets
+- [ ] `it` / `at` - Inner/around tag
+
+---
+
+## Marks & Jumps
+
+### Not Implemented
+- [ ] `m{a-z}` - Set local mark
+- [ ] `m{A-Z}` - Set global mark
+- [ ] `` `{mark} `` - Jump to mark (exact position)
+- [ ] `'{mark}` - Jump to mark (line start)
+- [ ] ``` `` ``` - Jump to previous position
+- [ ] `''` - Jump to previous line
+- [ ] `` `. `` - Jump to last change
+- [ ] `ctrl+o` - Jump back in jump list
+- [ ] `ctrl+i` - Jump forward in jump list
+
+---
+
+## Plugins / Extensions
+
+### Harpoon (File Navigation)
+- [ ] Quick file marks (1-4 files)
+- [ ] Add file to list
+- [ ] Navigate to marked file
+- [ ] Show file list
+
+### Telescope / Fuzzy Finder
+- [ ] File picker
+- [ ] Buffer picker
+- [ ] Grep/search
+- [ ] Command palette
+
+### File Explorer
+- [ ] Tree view
+- [ ] File operations (create, delete, rename)
+- [ ] Navigation
+
+### LSP Support
+- [ ] Go to definition
+- [ ] Find references
+- [ ] Hover information
+- [ ] Diagnostics
+- [ ] Code actions
+- [ ] Completion
+
+### Git Integration
+- [ ] Git status
+- [ ] Git diff
+- [ ] Git blame
+- [ ] Hunk navigation
+
+### Other
+- [ ] Multiple cursors
+- [ ] Snippets
+- [ ] Auto-pairs (brackets, quotes)
+- [ ] Surround (change surrounding chars)
+- [ ] Comment toggle
+- [ ] Indentation guides
+- [ ] Syntax highlighting
+- [ ] Statusline customization
+- [ ] Themes
+
+---
+
+## Editor Features
+
+### Display
+- [x] Line numbers
+- [x] Cursor position tracking
+- [x] Viewport/scrolling
+- [x] ScrollOff setting
+- [x] Relative line numbers
+- [ ] Cursor line highlight
+- [ ] Column highlight
+- [ ] Wrap/nowrap
+- [ ] Word wrap at window edge
+- [ ] Show whitespace characters
+- [ ] Color column (ruler)
+
+### Files
+- [ ] File reading
+- [ ] File writing
+- [ ] Auto-save
+- [ ] Backup files
+- [ ] Swap files
+- [ ] File encoding
+- [ ] Line endings (LF/CRLF)
+
+### Search & Replace
+- [ ] Incremental search
+- [ ] Search highlighting
+- [ ] Case sensitivity options
+- [ ] Regex support
+- [ ] Search and replace
+
+### Misc
+- [ ] Split windows
+- [ ] Tabs
+- [ ] Sessions
+- [ ] Persistent undo
+- [ ] Spell check
+
+---
+
+## Testing Coverage
+
+### Well Tested
+- [x] Basic motions (h, j, k, l)
+- [x] Word motions (w, e, b)
+- [x] Jump motions (G, gg, 0, $, _)
+- [x] Scroll actions (ctrl+u, ctrl+d)
+- [x] Delete operator (d, dd)
+- [x] Yank operator (y, yy)
+- [x] Paste actions (p, P)
+- [x] Insert mode entry (i, a, I, A, o, O)
+- [x] Insert mode editing (enter, backspace, delete, tab, ctrl+w)
+- [x] Visual modes (v, V, ctrl+v)
+- [x] Visual mode with motions
+- [x] Delete actions (x, D)
+- [x] Command mode basics
+- [x] Register behavior