# Keyboard and mouse
| `Ctrl+B` / `I` / `D` / `E` | Bold / italic / strikethrough / code |
| `Ctrl+K` | Link |
| `Ctrl+1` / `2` / `3`, `Ctrl+Shift+N` | Heading, normal |
| `Ctrl+U` / `Ctrl+L` / `Ctrl+Shift+L` | Bullet / numbered / task list |
| `Ctrl+Enter` | Check / uncheck task |
| `Ctrl+Shift+Q` | Block quote |
| `Tab` / `Shift+Tab` | Nest / un-nest list items, indent / outdent |
| `Ctrl+Z`, `Ctrl+Y` | Undo, redo |
| `Ctrl` + `+` / `-` / `0`, `Ctrl` + wheel | Zoom |
| Wheel, `Shift` + wheel | Scroll vertically / horizontally |
| Drag the scrollbars | Scroll |
Source mode: Enter continues lists and quotes, Tab nests items, the toolbar
edits the Markdown text of the selected lines.