## Selecting Lines for Operations
```plaintext
:1,20s/hello/world         # search/replace only for first 20 lines
:20,$s/hello/world         # search/replace for lines from 20 onwards
:$-20,$s/hello/world       # search/replace for last 20 lines of file
:.,.+5s/hello/world        # search/replace from current line to 5 lines down
```

## Search And Replace
```plaintext
:s@hello@<p>hello</p>      # if / occurs in search/replace string
```

## Matching and Deleting
```plaintext
:g/pattern/d # delete matched lines
:g/pattern/-1d # delete line before each match
:g/pattern/+1d # delete line after each match
:g/pattern/-1,+1d # delete from line before to line after
:%d # delete all lines (useful to abort Ctrl+X+E
:.,$d # delete all lines from current onwards
:1,.d # delete all lines from start to current
```

## Folding
```plaintext

```