In Visual Studio, you can show line numbers by following these steps:

1. Click on the “Tools” menu.
2. Select “Options”.
3. In the Options dialog box, expand “Text Editor”.
4. Expand “All Languages” (or select the specific language you want).
5. Check the “Line numbers” checkbox.
6. Click “OK”.

For the next steps, you might want to explore other settings under “Text Editor” or try using the line numbers in your code editing.